create Makefile

Makefile

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+# Image URL to use all building/pushing image targets
+TAG ?= latest
+IMG ?= ghcr.io/undistro/kubexns:${TAG}
+
+# Setting SHELL to bash allows bash commands to be executed by recipes.
+# Options are set to exit when a recipe line exits non-zero or a piped command fails.
+SHELL = /usr/bin/env bash -o pipefail
+.SHELLFLAGS = -ec
+
+.PHONY: all
+all: build
+
+##@ General
+
+.PHONY: help
+help: ## Display this help.
+	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m<target>\033[0m\n"} /^[a-zA-Z_0-9-]+:.*?##/ { printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)
+
+##@ Development
+
+.PHONY: fmt
+fmt: ## Run go fmt against code.
+	go fmt ./...
+
+.PHONY: vet
+vet: ## Run go vet against code.
+	go vet ./...
+
+.PHONY: test
+test: fmt vet ## Run tests.
+	go test ./... -coverprofile cover.out
+
+.PHONY: addlicense
+addlicense: ## Add copyright license headers in source code files.
+	@test -s $(LOCALBIN)/addlicense || GOBIN=$(LOCALBIN) go install github.com/google/addlicense@latest
+	$(LOCALBIN)/addlicense -c "Undistro Authors" -l "apache" -ignore ".github/**" -ignore ".idea/**" -ignore "dist/**" -ignore ".goreleaser.yaml" .
+
+.PHONY: checklicense
+checklicense: ## Check copyright license headers in source code files.
+	@test -s $(LOCALBIN)/addlicense || GOBIN=$(LOCALBIN) go install github.com/google/addlicense@latest
+	$(LOCALBIN)/addlicense -c "Undistro Authors" -l "apache" -ignore ".github/**" -ignore ".idea/**" -ignore "dist/**" -ignore ".goreleaser.yaml" -check .
+
+##@ Build
+
+.PHONY: build
+build: fmt vet ## Build binary.
+	go build -o bin/kubexns main.go
+
+.PHONY: run
+run: fmt vet ## Run from your host.
+	go run ./main.go
+
+PLATFORMS ?= linux/arm64,linux/amd64,linux/s390x,linux/ppc64le
+.PHONY: docker-buildx
+docker-buildx: test ## Build and push docker image for cross-platform support.
+	sed -e '1 s/\(^FROM\)/FROM --platform=\$$\{BUILDPLATFORM\}/; t' -e ' 1,// s//FROM --platform=\$$\{BUILDPLATFORM\}/' Dockerfile > Dockerfile.cross
+	- docker buildx create --name cross-builder
+	docker buildx use cross-builder
+	- docker buildx build --push --platform=$(PLATFORMS) --build-arg VERSION=${TAG} --tag ${IMG} -f Dockerfile.cross .
+	- docker buildx rm cross-builder
+	rm Dockerfile.cross
+
+.PHONY: docker-build
+docker-build: test ## Build docker image.
+	docker build --build-arg VERSION=${TAG} -t ${IMG} .
+
+.PHONY: docker-push
+docker-push: ## Push docker image.
+	docker push ${IMG}
+
+## Location to install dependencies to
+LOCALBIN ?= $(shell pwd)/bin
+$(LOCALBIN):
+	mkdir -p $(LOCALBIN)