finish makefile

controller/Makefile

@@ -30,6 +30,9 @@ ifeq (,$(findstring $(GOPATH)/bin,$(PATH)))
 $(error $$GOPATH/bin directory is not in your $$PATH)
 endif
 
+.PHONY: all
+all: build
+
 ##@ General
 
 .PHONY: help
@@ -59,12 +62,32 @@ run: manifests generate fmt vet ## run a controller from your host
 release: manifests generate fmt vet ## builds release version of the app. Requires GoReleaser to work.
 	goreleaser build --clean --single-target --snapshot
 
-docker-build: ## build Docker image with the driver
+# If you wish to build the manager image targeting other platforms you can use the --platform flag.
+# (i.e. docker build --platform linux/arm64). However, you must enable docker buildKit for it.
+# More info: https://docs.docker.com/develop/develop-images/build_enhancements/
+docker-build: ## build Docker image with the manager
 	docker build --no-cache -t ${IMG} .
 
-docker-push: ## push Docker image with the driver
+docker-push: ## push docker image with the manager
 	docker push ${IMG}
 
+# PLATFORMS defines the target platforms for the manager image be built to provide support to multiple
+# architectures. (i.e. make docker-buildx IMG=myregistry/mypoperator:0.0.1). To use this option you need to:
+# - be able to use docker buildx. More info: https://docs.docker.com/build/buildx/
+# - have enabled BuildKit. More info: https://docs.docker.com/develop/develop-images/build_enhancements/
+# - be able to push the image to your registry (i.e. if you do not set a valid value via IMG=<myregistry/image:<tag>> then the export will fail)
+# To adequately provide solutions that are compatible with multiple platforms, you should consider using this option.
+PLATFORMS ?= linux/arm64,linux/amd64,linux/s390x,linux/ppc64le
+.PHONY: docker-buildx
+docker-buildx: ## Build and push docker image for the manager for cross-platform support
+	# copy existing Dockerfile and insert --platform=${BUILDPLATFORM} into Dockerfile.cross, and preserve the original Dockerfile
+	sed -e '1 s/\(^FROM\)/FROM --platform=\$$\{BUILDPLATFORM\}/; t' -e ' 1,// s//FROM --platform=\$$\{BUILDPLATFORM\}/' Dockerfile > Dockerfile.cross
+	- docker buildx create --name project-v3-builder
+	docker buildx use project-v3-builder
+	- docker buildx build --push --platform=$(PLATFORMS) --tag ${IMG} -f Dockerfile.cross .
+	- docker buildx rm project-v3-builder
+	rm Dockerfile.cross
+
 ##@ Codegen
 
 .PHONY: manifests