Merge pull request #9 from sharifelgamal/multiarch

change makefile to support multiarch docker manifest

Author: sharifelgamal

Makefile

@@ -1,15 +1,12 @@
 REGISTRY?=gcr.io/k8s-minikube
 VERSION=v0.0.3
+GOOS?=$(shell go env GOOS)
 
-build:
-	CGO_ENABLED=0 GOOS=linux go build -o out/gcp-auth-webhook -ldflags=$(PROVISIONER_LDFLAGS) server.go
+build: ## Build the gcp-auth-webhook binary
+	CGO_ENABLED=0 GOOS=linux go build -o out/gcp-auth-webhook server.go
 
 .PHONY: image
-image: build
-	docker build -t $(REGISTRY)/gcp-auth-webhook:$(VERSION) -f Dockerfile ./out
-
-
-.PHONY: push
-push: image
-	docker push $(REGISTRY)/gcp-auth-webhook:$(VERSION)
-
+image: build ## Create and push multiarch manifest and images
+	curl -L https://github.com/google/ko/releases/download/v0.8.0/ko_0.8.0_$(GOOS)_x86_64.tar.gz | tar xzf - ko && chmod +x ./ko
+	KO_DOCKER_REPO=$(REGISTRY) ./ko publish -B . --platform all -t $(VERSION)
+	rm ./ko