Add Pull Request CI (Snapshot) to support PRs from external contributors

Author: evg-tso

.github/workflows/pull_request_ci.yml

@@ -0,0 +1,25 @@
+name: Pull Request CI (Snapshot)
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+
+jobs:
+  build:
+    permissions:
+      contents: read
+    uses: ./.github/workflows/build.yml
+
+  event_file:
+    needs: build
+    name: "Event File"
+    runs-on: ubuntu-latest
+    steps:
+      - name: Upload
+        uses: actions/upload-artifact@v4
+        with:
+          name: Event File
+          path: ${{ github.event_path }}

.github/workflows/test_results.yml

@@ -4,6 +4,7 @@ on:
   workflow_run:
     workflows:
       - "Branch CI (Snapshot)"
+      - "Pull Request CI (Snapshot)"
     types:
       - completed