build docker images for amd64 and arm64

Signed-off-by: Adrian Gebhart <adrian@pestotoast.de>

.github/workflows/build_images.yml

@@ -0,0 +1,60 @@
+name: Build docker images
+
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [ 
+          {arch: 'linux/amd64',  tag: 'develop' },
+          {arch: 'linux/arm64', tag: 'develop-arm64' } ]
+        container: [
+          {name: 'aio-apache', context: './Containers/apache'},
+          {name: 'aio-borgbackup', context: './Containers/borgbackup'},
+          {name: 'aio-collabora', context: './Containers/collabora'},
+          {name: 'aio-domaincheck', context: './Containers/domaincheck'},
+          {name: 'all-in-one', context: './Containers/mastercontainer'},
+          {name: 'aio-nextcloud', context: './Containers/nextcloud'},
+          {name: 'aio-postgresql', context: './Containers/postgresql'},
+          {name: 'aio-redis', context: './Containers/redis'},
+          {name: 'aio-talk', context: './Containers/talk'},
+          {name: 'aio-watchtower', context: './Containers/watchtower'}]
+
+    steps:
+      - name: Check out the repo
+        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: Docker metadata
+        id: metadata
+        uses: docker/metadata-action@v3
+        with:
+          images: |
+            ${{ secrets.DOCKERHUB_USERNAME }}/${{ matrix.container.name }}
+          tags: |
+            ${{ matrix.platform.tag }}
+
+      - name: Build docker image and push to dockerhub
+        uses: docker/build-push-action@v2
+        with:
+          context: ${{ matrix.container.context }}
+          platforms: ${{matrix.platform.arch}}
+          no-cache: true
+          push: true
+          tags: ${{ steps.metadata.outputs.tags }}