K8s: Add k8s codegen PR check (#91903)

.github/CODEOWNERS

@@ -725,6 +725,7 @@ embed.go @grafana/grafana-as-code
 /.github/workflows/i18n-crowdin-upload.yml @grafana/grafana-frontend-platform
 /.github/workflows/i18n-crowdin-download.yml @grafana/grafana-frontend-platform
 /.github/workflows/pr-go-workspace-check.yml @grafana/grafana-app-platform-squad
+/.github/workflows/pr-k8s-codegen-check.yml @grafana/grafana-app-platform-squad
 /.github/workflows/run-scenes-e2e.yml @grafana/dashboards-squad
 /.github/workflows/go_lint.yml @grafana/grafana-backend-services-squad
 /.github/workflows/trivy-scan.yml @grafana/grafana-backend-services-squad

.github/workflows/pr-k8s-codegen-check.yml

@@ -0,0 +1,38 @@
+name: "K8s Codegen Check"
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches: [main]
+    paths:
+      - "pkg/apis/**"
+      - "pkg/aggregator/apis/**"
+      - "pkg/apimachinery/apis/**"
+      - "hack/**"
+      - "*.sum"
+
+jobs:
+  check:
+    name: K8s Codegen Check
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Set go version
+      uses: actions/setup-go@v4
+      with:
+        go-version-file: go.mod
+
+    - name: Update k8s codegen
+      run: ./hack/update-codegen.sh
+
+    - name: Check for k8s codegen changes
+      run: |
+        if ! git diff --exit-code --quiet; then
+          echo "Changes detected:"
+          git diff
+          echo "Please run './hack/update-codegen.sh' and commit the changes."
+          exit 1
+        fi