Add ARM and ARM64 support

closes #21

.github/workflows/docker-hub.yml

@@ -28,6 +28,10 @@ jobs:
             echo -n "::set-output name=tags::akaunting/akaunting:"
             echo "$GITHUB_REF" | cut -d/ -f3- | tr '/' '_'
           fi
+      - 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
         if: github.event_name != 'pull_request'
         uses: docker/login-action@v1
@@ -39,6 +43,6 @@ jobs:
         with:
           context: .
           file: ./Dockerfile
-          platforms: linux/amd64
+          platforms: linux/amd64,linux/arm/v6,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.define-tags.outputs.tags }}