chore(tools): refactor CRD generation and add validation workflow

Signed-off-by: ivan katliarchuk <ivan.katliarchuk@gmail.com>

Author: ivankatliarchuk

.github/workflows/validate-crd.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
         with:
-          go-version-file: 'go.tool.mod'
+          go-version-file: 'go.mod'
 
       - name: Regenerate CRDs
         run: ./scripts/generate-crd.sh

charts/external-dns/crds/dnsendpoints.externaldns.k8s.io.yaml

@@ -89,6 +89,10 @@ spec:
                   format: int64
                   type: integer
               type: object
+          required:
+            - metadata
+            - spec
+            - status
           type: object
       served: true
       storage: true

config/crd/standard/dnsendpoints.externaldns.k8s.io.yaml

@@ -90,6 +90,10 @@ spec:
                   format: int64
                   type: integer
               type: object
+          required:
+            - metadata
+            - spec
+            - status
           type: object
       served: true
       storage: true

go.tool.mod

@@ -1,6 +1,6 @@
 module sigs.k8s.io/external-dns/tools
 
-go 1.25.5
+go 1.25.0
 
 tool (
 	github.com/google/yamlfmt/cmd/yamlfmt

scripts/generate-crd.sh

@@ -55,19 +55,19 @@ CONTROLLER_GEN="go tool -modfile=go.tool.mod controller-gen"
 YQ="go tool -modfile=go.tool.mod yq"
 YAMLFMT="go tool -modfile=go.tool.mod yamlfmt"
 
-echo "Generating CRDs using controller-gen..."
+echo " Generating CRDs using controller-gen..."
 
 # Step 1: Generate deepcopy methods for endpoint types
 # This creates zz_generated.deepcopy.go with DeepCopy/DeepCopyInto/DeepCopyObject methods
 # The 'object' generator adds these methods for types marked with +kubebuilder:object markers
-echo "→ Generating deepcopy for endpoint package..."
+echo "  → Generating deepcopy for endpoint package..."
 ${CONTROLLER_GEN} object crd:crdVersions=v1 paths="./endpoint/..."
 
 # Step 2: Generate CRD manifests for API types
 # - Generates CRDs from Go types with kubebuilder markers
 # - Outputs to stdout, formats with yamlfmt, then splits into individual files
 # - Each CRD is saved to config/crd/standard/<crd-name>.yaml
-echo "→ Generating CRDs for apis package..."
+echo "  → Generating CRDs for apis package..."
 ${CONTROLLER_GEN} object crd:crdVersions=v1 paths="./apis/..." output:crd:stdout | \
     ${YAMLFMT} - | \
     ${YQ} eval '.' --no-doc --split-exp '"./config/crd/standard/" + .metadata.name + ".yaml"'
@@ -76,9 +76,9 @@ ${CONTROLLER_GEN} object crd:crdVersions=v1 paths="./apis/..." output:crd:stdout
 # - Reads CRDs from config/crd/standard/
 # - Filters annotations to only keep kubernetes.io/* (removes controller-gen annotations)
 # - Splits and saves to charts/external-dns/crds/ for Helm chart packaging
-echo "→ Copying CRDs to chart directory..."
+echo "  → Copying CRDs to chart directory..."
 ${YQ} eval '.metadata.annotations |= with_entries(select(.key | test("kubernetes\.io")))' \
     --no-doc --split-exp '"./charts/external-dns/crds/" + .metadata.name + ".yaml"' \
     ./config/crd/standard/*.yaml
 
-echo "✅ CRD generation complete"
+echo -e "  ✅ CRD generation complete"