Add check for deepcopy files to CI (#3776)

This PR does 2 things:

It speeds up the deepcopy command and adds it to the manifest. This speed improvement is achieved by only searching in the relevant folders
It adds a check to the CI to verify that the deepcopy files were updated if needed

.github/workflows/ci.yaml

@@ -104,6 +104,21 @@ jobs:
         run: |
           make go/deadcode
 
+  generated-files:
+    name: Check generated files
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+      - uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
+        with:
+          go-version-file: "${{ github.workspace }}/go.mod"
+      - name: Check deepcopy files
+        id: deepcopy
+        run: |
+          make manifests/deepcopy
+          git diff --exit-code
+
   security:
     name: Code security scanning alerts
     runs-on: ubuntu-latest
@@ -186,7 +201,7 @@ jobs:
   build:
     name: Build images
     runs-on: ubuntu-latest
-    needs: [prepare, tests, linting]
+    needs: [prepare, tests, linting, generated-files]
     strategy:
       matrix:
         platform: [amd64, arm64, ppc64le, s390x]

hack/make/manifests/manifests.mk

@@ -2,8 +2,8 @@ manifests/prepare-directory:
 	find $(MANIFESTS_DIR) -type f -not -name 'kustomization.yaml' -delete
 
 ## Generates manifests e.g. CRD, RBAC etc, for Kubernetes and OpenShift
-manifests: manifests/prepare-directory manifests/kubernetes manifests/openshift
+manifests: manifests/prepare-directory manifests/kubernetes manifests/openshift manifests/deepcopy
 
 ## Generate deep copy files
-manifests/deepcopy:
-	controller-gen object:headerFile="hack/boilerplate.go.txt" paths="./..."
+manifests/deepcopy: prerequisites/controller-gen
+	controller-gen object:headerFile="hack/boilerplate.go.txt" paths="./pkg/api/..."