Multi arch docker build

.github/workflows/build-docker.yml

@@ -0,0 +1,46 @@
+name: Build docker images
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  publish_to_docker_hub:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      
+      - name: Prepare tags
+        id: prep
+        run: |
+          DOCKER_IMAGE=linkace/linkace
+          VERSION=${GITHUB_REF#refs/tags/}
+          TAGS="${DOCKER_IMAGE}:${VERSION},${DOCKER_IMAGE}:latest"
+          echo ::set-output name=tags::${TAGS}
+          
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+        
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+
+      - name: Build and push advanced image
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
+          push: true
+          tags: ${{ steps.prep.outputs.tags }}

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3-alpine
+FROM python:alpine3.12
 
 # Getting things ready
 WORKDIR /usr/src/shynet