ci: format Go with golangci-lint (envoyproxy#1289)

Signed-off-by: Hrushikesh Patil <[email protected]>

Author: anuraaga

Makefile

@@ -69,10 +69,7 @@ GO_FILES=$(shell git ls-files --cached --others --exclude-standard | grep '\.go$
 .PHONY: format
 format: ## Format the codebase.
 	@echo "format => *.go"
-	@gofmt -s -w $(GO_FILES)
-	@$(GO_TOOL) gofumpt -l -w $(GO_FILES)
-	@echo "gci => *.go"
-	@$(GO_TOOL) gci write -s standard -s default -s "prefix(github.com/envoyproxy/ai-gateway)" $(GO_FILES)
+	@$(GO_TOOL) golangci-lint fmt $(GO_FILES)
 	@echo "licenses => **"
 	@$(GO_TOOL) license-eye header fix
 	@echo "prettier => **.{yaml,yml}"

tools/go.mod

@@ -4,15 +4,13 @@ go 1.25
 
 tool (
 	github.com/apache/skywalking-eyes/cmd/license-eye
-	github.com/daixiang0/gci
 	github.com/editorconfig-checker/editorconfig-checker/v3/cmd/editorconfig-checker
 	github.com/elastic/crd-ref-docs
 	github.com/golangci/golangci-lint/v2/cmd/golangci-lint
 	github.com/tetratelabs/func-e/cmd/func-e
 	github.com/vladopajic/go-test-coverage/v2
 	github.com/wasilibs/go-prettier/v3/cmd/prettier
 	helm.sh/helm/v3/cmd/helm
-	mvdan.cc/gofumpt
 	sigs.k8s.io/controller-runtime/tools/setup-envtest
 	sigs.k8s.io/controller-tools/cmd/controller-gen
 	sigs.k8s.io/kind