Added github action build multi arch

.dockerignore

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+bin/*

.github/workflows/ci.yaml

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+name: Continuous Integration
+
+on: 
+  push:
+    paths-ignore:
+      - "*.md"
+    branches:
+      - master
+  
+jobs:
+  ci:
+    name: CI
+    runs-on: ubuntu-latest
+    env:
+        DOCKER_BUILDKIT: "1"
+    steps:
+      - 
+        name: Checkout code
+        uses: actions/checkout@v2
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
+          push: true
+          tags: |
+            acouvreur/traefik-ondemand-service:latest

Dockerfile

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+FROM golang:1.15.3-alpine AS build
+WORKDIR /src
+COPY . .
+RUN go build -o ondemand-service .
+FROM scratch AS bin
+COPY --from=build ondemand-service /