Add release workflow

Signed-off-by: Ali Ariff <ali.ariff12@gmail.com>

.github/workflows/release.yml

@@ -0,0 +1,26 @@
+name: Release
+on:
+  push:
+    tags:
+    - "*"
+jobs:
+  buildx:
+    name: Build & Push Multi Arch Images
+    runs-on: ubuntu-18.04
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Configure gcloud
+      uses: linkerd/linkerd2-action-gcloud@v1.0.2
+      with:
+        cloud_sdk_service_account_key: ${{ secrets.CLOUD_SDK_SERVICE_ACCOUNT_KEY }}
+        gcp_project: ${{ secrets.GCP_PROJECT }}
+        gcp_zone: ${{ secrets.GCP_ZONE }}
+    - name: Set up Docker Buildx
+      uses: crazy-max/ghaction-docker-buildx@v3
+    - name: Docker Buildx (build)
+      run: make images
+    - name: Docker Buildx (push)
+      run: make push
+    - name: Docker Check Manifest
+      run: make inspect-manifest

Dockerfile

@@ -1,11 +1,19 @@
 ## compile proxy-init utility
-FROM golang:1.12.9 as golang
+FROM --platform=$BUILDPLATFORM golang:1.12.9 as golang
 WORKDIR /build
+
+# cache dependencies
+COPY go.mod .
+COPY go.sum .
+RUN go mod download
+
+# build
 COPY . .
-RUN CGO_ENABLED=0 GOOS=linux go build -o /out/linkerd2-proxy-init -mod=readonly -ldflags "-s -w" -v
+ARG TARGETARCH
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=$TARGETARCH go build -o /out/linkerd2-proxy-init -mod=readonly -ldflags "-s -w" -v
 
 ## package runtime
-FROM debian:stretch-20190812-slim
+FROM --platform=$TARGETPLATFORM debian:stretch-20190812-slim
 RUN apt-get update \
     && apt-get install -y --no-install-recommends \
         iptables \

Makefile

@@ -1,6 +1,8 @@
 DOCKER_REGISTRY ?= gcr.io/linkerd-io
 REPO = $(DOCKER_REGISTRY)/proxy-init
 TESTER_REPO = buoyantio/iptables-tester
+VERSION ?= $(shell git describe --exact-match --tags 2> /dev/null || git rev-parse --short HEAD)
+SUPPORTED_ARCHS = linux/amd64,linux/arm64,linux/arm/v7
 
 .DEFAULT_GOAL := help
 
@@ -39,7 +41,7 @@ integration-test: image ## Perform integration test
 ###############
 .PHONY: image
 image: ## Build docker image for the project
-	docker build -t $(REPO):latest .
+	DOCKER_BUILDKIT=1 docker build -t $(REPO):latest .
 
 .PHONY: tester-image
 tester-image: ## Build docker image for the tester component
@@ -49,3 +51,26 @@ tester-image: ## Build docker image for the tester component
 kind-load: image tester-image ## Load the required image to KinD cluster
 	kind load docker-image $(REPO):latest
 	kind load docker-image $(TESTER_REPO):v1
+
+.PHONY: images
+images: ## Build multi arch docker images for the project
+	docker buildx build \
+		--platform $(SUPPORTED_ARCHS) \
+		--output "type=image,push=false" \
+		--tag $(REPO):$(VERSION) \
+		--tag $(REPO):latest \
+		.
+
+.PHONY: push
+push: images ## Push multi arch docker images to the registry
+	docker buildx build \
+		--platform $(SUPPORTED_ARCHS) \
+		--output "type=image,push=true" \
+		--tag $(REPO):$(VERSION) \
+		--tag $(REPO):latest \
+		.
+
+.PHONY: inspect-manifest
+inspect-manifest: ## Check the resulting images supported architecture
+	docker run --rm mplatform/mquery $(REPO):$(VERSION)
+	docker run --rm mplatform/mquery $(REPO):latest