docker arm builds

Fixes https://github.com/lovasoa/whitebophir/issues/142

.github/workflows/deploy.yml

         uses: actions/checkout@v2
       - name: Set env
         run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
       - name: Log in to Docker Hub
         uses: docker/login-action@v1
         with:
         uses: docker/build-push-action@v2
         with:
           push: true
-          tags: lovasoa/wbo:latest,lovasoa/wbo:${{ env.RELEASE_VERSION }}
+          tags: lovasoa/wbo:latest,lovasoa/wbo:${{ env.RELEASE_VERSION }}
+          platforms: linux/amd64,linux/arm64,linux/arm/v7