docker/build-push-action now supports caching

[mendhak]

FWIW, it seems Docker's build-push-action now supports caching using the Github Cache API. Currently it's experimental but seems to work well in the little testing I've done.

It's just two arguments to the action, cache-from and cache-to.

    - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: user/app:latest
          cache-from: type=gha
          cache-to: type=gha,mode=max

Could be worth a look.