fix: Multi-arch builds as one step

.github/workflows/build-push.yaml

@@ -19,11 +19,14 @@ on:
 
 jobs:
  build-and-push:
- strategy:
- matrix:
- arch:
- - linux/amd64
- - linux/arm64
+ ## The matrix build doesn't work right now, because the push step for the slowest arch
+ ## will overwrite the metadata for the faster arch.
+ ## We should implement this to fix it: https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners
+ # strategy:
+ # matrix:
+ # arch:
+ # - linux/amd64
+ # - linux/arm64
  permissions:
  packages: write
  contents: read
@@ -58,7 +61,7 @@ jobs:
  uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
  with:
  context: .
- platforms: "${{ matrix.arch }}"
+ platforms: linux/amd64,linux/arm64
  push: ${{ github.ref == 'refs/heads/master' }}
  tags: |
  ghcr.io/${{ github.repository }}:latest