🌱 add a verify rule for golang files import order (#177)

* 🌱 add a verify rule for golang files import order

This PR uses the [gci tool](https://github.com/daixiang0/gci) to make all go files' import section with a specific order, it will organize import with group with order：
1. standard library modules
2. 3rd party modules
3. modules in OCM org, like the `open-cluster-management.io/api`
4. current project `open-cluster-management.io/ocm` modules

developers can use the `make fmt-imports` to format the import automatically and the `make verify-fmt-imports` to check for any violation.

Signed-off-by: zhujian <jiazhu@redhat.com>

* 🌱 format the go files import

Signed-off-by: zhujian <jiazhu@redhat.com>

---------

Signed-off-by: zhujian <jiazhu@redhat.com>

Makefile

@@ -68,6 +68,21 @@ verify-gocilint:
 	go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.45.2
 	golangci-lint run --timeout=3m --modules-download-mode vendor ./...
 
+install-golang-gci:
+	go install github.com/daixiang0/gci@v0.10.1
+
+fmt-imports: install-golang-gci
+	gci write --skip-generated -s standard -s default -s "prefix(open-cluster-management.io)" -s "prefix(open-cluster-management.io/ocm)" cmd pkg test dependencymagnet
+
+verify-fmt-imports: install-golang-gci
+	@output=$$(gci diff --skip-generated -s standard -s default -s "prefix(open-cluster-management.io)" -s "prefix(open-cluster-management.io/ocm)" cmd pkg test dependencymagnet); \
+	if [ -n "$$output" ]; then \
+	    echo "Diff output is not empty: $$output"; \
+	    exit 1; \
+	else \
+	    echo "Diff output is empty"; \
+	fi
+
 verify: verify-crds
 
 ensure-operator-sdk: