ci/gha: introduce step to check go.mod version

Introduce the step to validate if the go.mod is in conformance with
Kubernetes project standard by using the patch version from the build env
(ending with .0, x.y.0).

Author: mtulio

.github/workflows/deps.yml

@@ -47,3 +47,20 @@ jobs:
         uses: golang/govulncheck-action@v1
         with:
           go-version-file: tests/e2e/go.mod
+  gomod-dotzero-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout Repository"
+        uses: actions/checkout@v4
+        with:
+          show-progress: false
+      - name: "tests/e2e/go.mod must use Go version major.minor.0"
+        env:
+          GO_MOD_FILE: go.mod
+        run: |
+          test $(grep "^go " $GO_MOD_FILE | awk '{print $2}' | cut -d. -f3) != 0 && exit 1
+      - name: "tests/e2e/go.mod must use Go version major.minor.0"
+        env:
+          GO_MOD_FILE: tests/e2e/go.mod
+        run: |
+          test $(grep "^go " $GO_MOD_FILE | awk '{print $2}' | cut -d. -f3) != 0 && exit 1

Makefile

@@ -18,6 +18,7 @@ SHELL := /bin/bash
 GOOS ?= $(shell go env GOOS)
 GOARCH ?= $(shell go env GOARCH)
 GOPROXY ?= $(shell go env GOPROXY)
+GO_DIRECTIVE_VERSION ?= 1.24.0
 GIT_VERSION ?= $(shell git describe --dirty --tags --match='v*')
 VERSION ?= $(GIT_VERSION)
 IMAGE_REPOSITORY ?= provider-aws/cloud-controller-manager
@@ -120,7 +121,7 @@ e2e.test:
 	mv tests/e2e/e2e.test e2e.test
 
 .PHONY: check
-check: verify-fmt verify-lint vet
+check: verify-fmt verify-lint vet verify-go-directive
 
 .PHONY: develop
 develop: aws-cloud-controller-manager test update-fmt check
@@ -142,6 +143,12 @@ verify-lint:
 verify-codegen:
 	./hack/verify-codegen.sh
 
+.PHONY: verify-go-directive
+verify-go-directive:
+	# use the core Cluster API script directly to verify the go directive matches the desired one.
+	# ref: https://github.com/kubernetes-sigs/cluster-api/blob/v1.10.7/hack/verify-go-directive.sh
+	curl --retry $(CURL_RETRIES) -fsL https://raw.githubusercontent.com/kubernetes-sigs/cluster-api/refs/tags/v1.11.0/hack/verify-go-directive.sh | bash -s -- -g $(GOLANG_DIRECTIVE_VERSION)
+
 .PHONY: vet
 vet:
 	go vet ./...