Start publishing arm64

Also switch to the official docker steps in GitHub Actions.

.github/workflows/run-tests.yml

@@ -1,5 +1,13 @@
 name: Run Tests
-on: [push, pull_request, create]
+on: 
+  push:
+    branches:
+      - 'master'
+    tags:
+      - '*'
+  pull_request:
+    branches:
+      - '*'
 jobs:
   runTests:
     runs-on: ubuntu-latest
@@ -7,6 +15,10 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: 'recursive'
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
       - uses: actions/setup-java@v2
         with:
           distribution: 'adopt'
@@ -17,8 +29,26 @@ jobs:
         run: |
           mvn package
           ./src/test/resources/run-s3-tests.sh
-      - name: Build Docker Image
-        run: ./publish_img.sh
-        env:
-          DOCKER_USER: ${{ secrets.DOCKER_USER }}
-          DOCKER_PASS: ${{ secrets.DOCKER_PASS }}
+      - name: Login to DockerHub
+        uses: docker/login-action@v1 
+        if: github.event_name != 'pull_request'
+        with:
+          username: ${{ secrets.DOCKER_USER }}
+          password: ${{ secrets.DOCKER_PASS }}
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: andrewgaul/s3proxy
+          tags: |
+            type=sha,event=branch
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}

publish_img.sh

@@ -1,18 +0,0 @@
-#!/usr/bin/env bash
-
-set -o errexit
-set -o nounset
-set -o pipefail
-
-REPO=andrewgaul/s3proxy
-
-docker login -u "$DOCKER_USER" -p "$DOCKER_PASS" docker.io
-docker buildx build --platform linux/amd64 -t $REPO:latest .
-
-if [[ "$GITHUB_EVENT_NAME" == "push" && $GITHUB_REF == refs/heads/master ]]; then
-  docker tag $REPO:latest $REPO:${GITHUB_SHA::8}
-  docker push --all-tags $REPO
-elif [[ "$GITHUB_EVENT_NAME" == "create" && $GITHUB_REF == refs/tags/* ]]; then
-  docker tag $REPO:latest $REPO:${GITHUB_REF#refs/tags/}
-  docker push --all-tags $REPO
-fi