✨ Build image for multiple architectures (#11)

Author: shrink

.github/workflows/build.yml

@@ -20,6 +20,7 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GHCR_PAT }}
       - uses: docker/setup-buildx-action@v1
+      - uses: docker/setup-qemu-action@v1
       - name: Cache Docker layers
         uses: actions/cache@v2
         with:
@@ -35,6 +36,7 @@ jobs:
         with:
           cache-from: type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache
+          platforms: linux/amd64,linux/arm64
           build-args: PHP=${{ matrix.php }}
           push: true
           tags: ghcr.io/${{ github.repository }}:${{ steps.push.outputs.sha }}