Improve CI security and maintanability

.github/dependabot.yml

@@ -0,0 +1,18 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    commit-message:
+      prefix: "actions"
+    schedule:
+      interval: "daily"
+    groups:
+      actions-dependencies:
+        applies-to: version-updates
+        patterns:
+        - "*"

.github/workflows/CI-cygwin.yml

@@ -37,12 +37,12 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: Set up Cygwin
-        uses: cygwin/cygwin-install-action@master
+        uses: cygwin/cygwin-install-action@f2009323764960f80959895c7bc3bb30210afe4d # v6
         with:
           platform: ${{ matrix.platform }}
           packages: ${{ matrix.packages }}

.github/workflows/CI-mingw.yml

@@ -33,12 +33,12 @@ jobs:
     timeout-minutes: 19 # max + 3*std of the last 7K runs
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: Set up MSYS2
-        uses: msys2/setup-msys2@v2
+        uses: msys2/setup-msys2@fb197b72ce45fb24f17bf3f807a388985654d1f2 # v2.29.0
         with:
           release: false # use pre-installed
           # TODO: install mingw-w64-x86_64-make and use mingw32.make instead - currently fails with "Windows Subsystem for Linux has no installed distributions."
@@ -49,7 +49,7 @@ jobs:
             mingw-w64-x86_64-gcc
 
       - name: ccache
-        uses: hendrikmuhs/[email protected]
+        uses: hendrikmuhs/ccache-action@5ebbd400eff9e74630f759d94ddd7b6c26299639 # v1.2.20
         with:
           key: ${{ github.workflow }}-${{ github.job }}-${{ matrix.os }}
 

.github/workflows/CI-unixish-docker.yml

@@ -38,7 +38,7 @@ jobs:
       image: ${{ matrix.image }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
@@ -56,7 +56,7 @@ jobs:
       # needs to be called after the package installation since
       # - it doesn't call "apt-get update"
       - name: ccache
-        uses: hendrikmuhs/[email protected]
+        uses: hendrikmuhs/ccache-action@5ebbd400eff9e74630f759d94ddd7b6c26299639 # v1.2.20
         with:
           key: ${{ github.workflow }}-${{ matrix.image }}
 
@@ -91,7 +91,7 @@ jobs:
       image: ${{ matrix.image }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
@@ -104,7 +104,7 @@ jobs:
       # needs to be called after the package installation since
       # - it doesn't call "apt-get update"
       - name: ccache
-        uses: hendrikmuhs/[email protected]
+        uses: hendrikmuhs/ccache-action@5ebbd400eff9e74630f759d94ddd7b6c26299639 # v1.2.20
         with:
           key: ${{ github.workflow }}-${{ matrix.image }}
 

.github/workflows/CI-unixish.yml

@@ -30,12 +30,12 @@ jobs:
       CCACHE_SLOPPINESS: pch_defines,time_macros
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: ccache
-        uses: hendrikmuhs/[email protected]
+        uses: hendrikmuhs/ccache-action@5ebbd400eff9e74630f759d94ddd7b6c26299639 # v1.2.20
         with:
           key: ${{ github.workflow }}-${{ github.job }}-${{ matrix.os }}
 
@@ -85,19 +85,19 @@ jobs:
       CCACHE_SLOPPINESS: pch_defines,time_macros
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: ccache
-        uses: hendrikmuhs/[email protected]
+        uses: hendrikmuhs/ccache-action@5ebbd400eff9e74630f759d94ddd7b6c26299639 # v1.2.20
         with:
           key: ${{ github.workflow }}-${{ github.job }}-${{ matrix.os }}
 
       # TODO: move latest compiler to separate step
       # TODO: bail out on warnings with latest GCC
       - name: Set up GCC
-        uses: egor-tensin/setup-gcc@v1
+        uses: egor-tensin/setup-gcc@eaa888eb19115a521fa72b65cd94fe1f25bbcaac # v1.3
         if: false  # matrix.os == 'ubuntu-22.04'
         with:
           version: 13
@@ -201,12 +201,12 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: ccache
-        uses: hendrikmuhs/[email protected]
+        uses: hendrikmuhs/ccache-action@5ebbd400eff9e74630f759d94ddd7b6c26299639 # v1.2.20
         with:
           key: ${{ github.workflow }}-${{ github.job }}-${{ matrix.os }}
 
@@ -235,12 +235,12 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: ccache
-        uses: hendrikmuhs/[email protected]
+        uses: hendrikmuhs/ccache-action@5ebbd400eff9e74630f759d94ddd7b6c26299639 # v1.2.20
         with:
           key: ${{ github.workflow }}-${{ github.job }}-${{ matrix.os }}
 
@@ -269,7 +269,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
@@ -297,12 +297,12 @@ jobs:
       CCACHE_SLOPPINESS: pch_defines,time_macros
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: ccache
-        uses: hendrikmuhs/[email protected]
+        uses: hendrikmuhs/ccache-action@5ebbd400eff9e74630f759d94ddd7b6c26299639 # v1.2.20
         with:
           key: ${{ github.workflow }}-${{ github.job }}-${{ matrix.os }}
 
@@ -359,12 +359,12 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: ccache
-        uses: hendrikmuhs/[email protected]
+        uses: hendrikmuhs/ccache-action@5ebbd400eff9e74630f759d94ddd7b6c26299639 # v1.2.20
         with:
           key: ${{ github.workflow }}-${{ github.job }}-${{ matrix.os }}
 
@@ -597,12 +597,12 @@ jobs:
     runs-on: ubuntu-22.04 # run on the latest image only
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: ccache
-        uses: hendrikmuhs/[email protected]
+        uses: hendrikmuhs/ccache-action@5ebbd400eff9e74630f759d94ddd7b6c26299639 # v1.2.20
         with:
           key: ${{ github.workflow }}-${{ github.job }}-${{ matrix.os }}
 

.github/workflows/CI-windows.yml

@@ -33,17 +33,17 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: Set up Visual Studio environment
-        uses: ilammy/msvc-dev-cmd@v1
+        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756 # v1.13.0
         with:
           arch: x64
 
       - name: Install Qt ${{ matrix.qt_ver }}
-        uses: jurplel/install-qt-action@v4
+        uses: jurplel/install-qt-action@d325aaf2a8baeeda41ad0b5d39f84a6af9bcf005 # v4.3.0
         with:
           version: ${{ matrix.qt_ver }}
           modules: 'qtcharts'
@@ -87,25 +87,25 @@ jobs:
       PCRE_VERSION: 8.45
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: Set up Python
         if: matrix.config == 'release'
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548 # v6.1.0
         with:
           python-version: '3.14'
           check-latest: true
 
       - name: Set up Visual Studio environment
-        uses: ilammy/msvc-dev-cmd@v1
+        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756 # v1.13.0
         with:
           arch: x64
 
       - name: Cache PCRE
         id: cache-pcre
-        uses: actions/cache@v4
+        uses: actions/cache@9255dc7a253b0ccc959486e2bca901246202afeb # v5.0.1
         with:
           path: |
             externals\pcre.h

.github/workflows/asan.yml

@@ -28,17 +28,17 @@ jobs:
       CCACHE_SLOPPINESS: pch_defines,time_macros
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - name: ccache
-        uses: hendrikmuhs/[email protected]
+        uses: hendrikmuhs/ccache-action@5ebbd400eff9e74630f759d94ddd7b6c26299639 # v1.2.20
         with:
           key: ${{ github.workflow }}-${{ github.job }}-${{ matrix.os }}
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548 # v6.1.0
         with:
           python-version: '3.14'
           check-latest: true
@@ -57,7 +57,7 @@ jobs:
           sudo ./llvm.sh 21
 
       - name: Install Qt ${{ env.QT_VERSION }}
-        uses: jurplel/install-qt-action@v4
+        uses: jurplel/install-qt-action@d325aaf2a8baeeda41ad0b5d39f84a6af9bcf005 # v4.3.0
         with:
           version: ${{ env.QT_VERSION }}
           modules: 'qtcharts'

.github/workflows/buildman.yml

@@ -19,34 +19,34 @@ jobs:
   convert_via_pandoc:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
       - run: |
           mkdir output
 
-      - uses: docker://pandoc/latex:3.6.3
+      - uses: docker://pandoc/latex:3.6.3@sha256:48831aabd0a24e180a34c0bc5dd09792af43dbd7c2a2d394fbc6b10f9c48fe50
         with:
           args: --output=output/manual.html man/manual.md
 
-      - uses: docker://pandoc/latex:3.6.3
+      - uses: docker://pandoc/latex:3.6.3@sha256:48831aabd0a24e180a34c0bc5dd09792af43dbd7c2a2d394fbc6b10f9c48fe50
         with:
           args: --output=output/manual.pdf man/manual.md
 
-      - uses: docker://pandoc/latex:3.6.3
+      - uses: docker://pandoc/latex:3.6.3@sha256:48831aabd0a24e180a34c0bc5dd09792af43dbd7c2a2d394fbc6b10f9c48fe50
         with:
           args: --output=output/manual-premium.pdf man/manual-premium.md
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
         with:
           name: output
           path: output
 
   manpage:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
@@ -59,7 +59,7 @@ jobs:
         run: |
           make man
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
         with:
           name: cppcheck.1
           path: cppcheck.1

.github/workflows/cifuzz.yml

@@ -14,20 +14,20 @@ jobs:
     steps:
     - name: Build Fuzzers
       id: build
-      uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
+      uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@6f5791d8b0ca004e5d35f8d75407347c7848f3b0 # master
       with:
         oss-fuzz-project-name: 'cppcheck'
         dry-run: false
         language: c++
     - name: Run Fuzzers
-      uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
+      uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@6f5791d8b0ca004e5d35f8d75407347c7848f3b0 # master
       with:
         oss-fuzz-project-name: 'cppcheck'
         fuzz-seconds: 300
         dry-run: false
         language: c++
     - name: Upload Crash
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
       if: failure() && steps.build.outcome == 'success'
       with:
         name: artifacts

.github/workflows/clang-tidy.yml

@@ -27,7 +27,7 @@ jobs:
       QT_VERSION: 6.10.0
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           persist-credentials: false
 
@@ -47,7 +47,7 @@ jobs:
           sudo apt-get install -y clang-tidy-21
 
       - name: Install Qt ${{ env.QT_VERSION }}
-        uses: jurplel/install-qt-action@v4
+        uses: jurplel/install-qt-action@d325aaf2a8baeeda41ad0b5d39f84a6af9bcf005 # v4.3.0
         with:
           version: ${{ env.QT_VERSION }}
           modules: 'qtcharts'
@@ -86,7 +86,7 @@ jobs:
         run: |
           cmake --build cmake.output --target run-clang-tidy-csa 2> /dev/null
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
         if: success() || failure()
         with:
           name: Compilation Database