Publish multi-arch image with Docker buildx

.github/workflows/build.yml

@@ -0,0 +1,20 @@
+name: build
+
+on:
+  push:
+    branches: '*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: crazy-max/ghaction-docker-buildx@v1
+      - name: build
+        run: |
+          echo "${{ secrets.DOCKER_PASSWORD }}" | docker login --username "${{ secrets.DOCKER_USERNAME }}" --password-stdin
+          docker buildx build --platform "linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64" \
+            --output "type=image,push=true" \
+            --build-arg "REVISION=${GITHUB_SHA::8}" \
+            --tag "docker.io/stefanprodan/podinfo:multiarch" \
+            --file Dockerfile .

Dockerfile

@@ -1,4 +1,6 @@
-FROM golang:1.14 as builder
+FROM --platform=${TARGETPLATFORM:-linux/amd64} golang:1.14-alpine as builder
+
+ARG REVISION
 
 RUN mkdir -p /podinfo/
 
@@ -8,19 +10,15 @@ COPY . .
 
 RUN go mod download
 
-RUN go test -v -race ./...
-
-RUN GIT_COMMIT=$(git rev-list -1 HEAD) && \
-    CGO_ENABLED=0 GOOS=linux go build -ldflags "-s -w \
-    -X github.com/stefanprodan/podinfo/pkg/version.REVISION=${GIT_COMMIT}" \
+RUN CGO_ENABLED=0 go build -ldflags "-s -w \
+    -X github.com/stefanprodan/podinfo/pkg/version.REVISION=${REVISION}" \
     -a -o bin/podinfo cmd/podinfo/*
 
-RUN GIT_COMMIT=$(git rev-list -1 HEAD) && \
-    CGO_ENABLED=0 GOOS=linux go build -ldflags "-s -w \
-    -X github.com/stefanprodan/podinfo/pkg/version.REVISION=${GIT_COMMIT}" \
+RUN CGO_ENABLED=0 go build -ldflags "-s -w \
+    -X github.com/stefanprodan/podinfo/pkg/version.REVISION=${REVISION}" \
     -a -o bin/podcli cmd/podcli/*
 
-FROM alpine:3.11
+FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine:3.11
 
 RUN addgroup -S app \
     && adduser -S -g app app \