Add dockerfile test to github actions (#110191)

* Add dockerfile test to github actions

* fix github action

* Update CODEOWNERS

.github/CODEOWNERS

@@ -1256,6 +1256,7 @@ embed.go @grafana/grafana-as-code
 /.github/zizmor.yml @grafana/grafana-developer-enablement-squad
 /.github/license_finder.yaml @bergquist
 /.github/actionlint.yaml @grafana/grafana-developer-enablement-squad
+/.github/workflows/pr-test-docker.yml @grafana/grafana-developer-enablement-squad
 
 # Generated files not requiring owner approval
 /packages/grafana-data/src/types/featureToggles.gen.ts @grafanabot

.github/actions/change-detection/action.yml

@@ -28,6 +28,9 @@ outputs:
   docs:
     description: Whether the docs or self have changed in any way
     value: ${{ steps.changed-files.outputs.docs_any_changed || 'true' }}
+  dockerfile:
+    description: Whether the dockerfile or self have changed in any way
+    value: ${{ steps.changed-files.outputs.dockerfile_any_changed || 'true' }}
 runs:
   using: composite
   steps:
@@ -42,6 +45,8 @@ runs:
           self:
             - '.github/actions/change-detection/**'
             - '${{ inputs.self }}'
+          dockerfile:
+            - 'Dockerfile'
           backend:
             - '!*.md'
             - '!docs/**'
@@ -151,3 +156,5 @@ runs:
         echo " --> ${{ steps.changed-files.outputs.dev_tooling_all_changed_files }}"
         echo "Docs: ${{ steps.changed-files.outputs.docs_any_changed || 'true' }}"
         echo " --> ${{ steps.changed-files.outputs.docs_all_changed_files }}"
+        echo "Dockerfile: ${{ steps.changed-files.outputs.dockerfile_any_changed || 'true' }}"
+        echo " --> ${{ steps.changed-files.outputs.dockerfile_all_changed_files }}"

.github/workflows/pr-test-docker.yml

@@ -0,0 +1,39 @@
+name: Test Dockerfile
+
+on:
+  pull_request:
+
+jobs:
+  detect-changes:
+    # Run on `grafana/grafana` main branch, or on pull requests to prevent double-running on mirrors
+    name: Detect whether code changed
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    outputs:
+      changed: ${{ steps.detect-changes.outputs.backend || steps.detect-changes.outputs.frontend || steps.detect-changes.outputs.dockerfile }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: true # required to get more history in the changed-files action
+          fetch-depth: 2
+      - name: Detect changes
+        id: detect-changes
+        uses: ./.github/actions/change-detection
+        with:
+          self: .github/workflows/pr-test-integration.yml
+
+  build-dockerfile:
+    needs: detect-changes
+    if: needs.detect-changes.outputs.changed == 'true'
+    runs-on: ubuntu-x64-large-io
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - uses: docker/setup-docker-action@b60f85385d03ac8acfca6d9996982511d8620a19 # v4
+      - name: Build Dockerfile
+        run: make build-docker-full