Add workflow for detecting a drift in the generated Dagger files

.github/workflows/acceptance-tests.yml

@@ -15,6 +15,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
       - name: Call Dagger Function
+        id: dagger
         uses: dagger/dagger-for-github@11048419d80c283890d0dd68187d44541f63dd89 # v5.11.0
         with:
           version: "0.11.9"

.github/workflows/check-dagger-drift.yml

@@ -0,0 +1,40 @@
+name: "Check for drift in Dagger files"
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  check-dagger-drift:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
+
+      - name: Determine Dagger version
+        id: dagger_version
+        run: |
+          sudo wget https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64 -O /usr/bin/yq
+          sudo chmod +x /usr/bin/yq
+          cat .github/workflows/acceptance-tests.yml| yq -r '.jobs.build.steps[] | select(.id == "dagger") | .with.version' > .version
+          echo "version=$(<.version)" > $GITHUB_OUTPUT
+          rm -rf .version
+
+      - uses: actions/cache@v4
+        id: cache_daggercli
+        with:
+          path: bin
+          key: daggercli-download-${{ steps.dagger_version.outputs.version }}
+
+      - name: Install Dagger CLI
+        if: steps.cache_daggercli.outputs.cache-hit != 'true'
+        shell: bash
+        run: |
+          curl -L https://dl.dagger.io/dagger/install.sh | DAGGER_VERSION=${{ steps.dagger_version.outputs.version }} sh
+        
+      - name: Check drift
+        run: |
+          set -e
+          make dagger-develop
+          test -z "$(git status --porcelain)" && "No drift detected" || "Drift detected. Run `make dagger-develop` and commit the changed files"

Makefile

@@ -41,3 +41,8 @@ cross: $(GOX)
 # Docker container
 container: static
 	docker build -t grafana/tanka .
+
+dagger-develop:
+	cp dagger/.gitignore{,.bak}
+	dagger develop
+	mv dagger/.gitignore{.bak,}