Lint Dockerfile files with Hadolint

Author: phansys

.docker/validate-against-schema/Dockerfile

@@ -1,3 +1,3 @@
-FROM alpine:3.11.3
+FROM alpine:3.17.3
 
-RUN apk add --no-cache libxml2-utils
+RUN apk add --no-cache libxml2-utils=2.10.4-r0

.github/workflows/continuous-integration.yml

@@ -82,6 +82,18 @@ jobs:
         with:
           args: "xmllint --noout --schema vendor/squizlabs/php_codesniffer/phpcs.xsd lib/Doctrine/ruleset.xml"
 
+  lint-dockerfile:
+    name: "Lint Dockerfile files with Hadolint"
+    runs-on: "ubuntu-22.04"
+
+    steps:
+      - uses: "actions/checkout@v3"
+
+      - name: "Lint Dockerfile"
+        uses: "hadolint/[email protected]"
+        with:
+          dockerfile: ".docker/validate-against-schema/Dockerfile"
+
   test-report:
     name: "Test report"