support arch arg in dockerfile (#207)

Dockerfile

@@ -1,5 +1,6 @@
 ARG BASE_IMAGE
 ARG BUILD_IMAGE
+ARG ARCH=amd64
 # Build the controller binary
 FROM $BUILD_IMAGE as builder
 
@@ -27,7 +28,7 @@ ENV VERSION_PKG=github.com/aws/amazon-vpc-resource-controller-k8s/pkg/version
 RUN GIT_VERSION=$(git describe --tags --always) && \
         GIT_COMMIT=$(git rev-parse HEAD) && \
         BUILD_DATE=$(date +%Y-%m-%dT%H:%M:%S%z) && \
-        CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build \
+        CGO_ENABLED=0 GOOS=linux GOARCH=${ARCH} GO111MODULE=on go build \
         -ldflags="-X ${VERSION_PKG}.GitVersion=${GIT_VERSION} -X ${VERSION_PKG}.GitCommit=${GIT_COMMIT} -X ${VERSION_PKG}.BuildDate=${BUILD_DATE}" -a -o controller main.go
 
 FROM $BASE_IMAGE

Makefile

@@ -12,6 +12,8 @@ BASE_IMAGE ?= public.ecr.aws/eks-distro-build-tooling/eks-distro-minimal-base-no
 BUILD_IMAGE ?= public.ecr.aws/bitnami/golang:1.20.1
 # Produce CRDs that work back to Kubernetes 1.11 (no version conversion)
 CRD_OPTIONS ?= "crd:trivialVersions=true"
+GOARCH ?= amd64
+PLATFORM ?= linux/amd64
 
 
 # Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
@@ -68,6 +70,10 @@ vet:
 generate: controller-gen
 	$(CONTROLLER_GEN) object:headerFile="scripts/templates/boilerplate.go.txt" paths="./..."
 
+# Build the docker image with buildx
+docker-buildx: check-env test
+	docker buildx build --platform=$(PLATFORM) -t $(IMAGE)-$(GOARCH) --build-arg BASE_IMAGE=$(BASE_IMAGE) --build-arg BUILD_IMAGE=$(BUILD_IMAGE) --build-arg $(GOARCH) --load .
+
 # Build the docker image
 docker-build: check-env test
 	docker build --build-arg BASE_IMAGE=$(BASE_IMAGE) --build-arg BUILD_IMAGE=$(BUILD_IMAGE) . -t ${IMAGE}