Explore using cache for docker build

[danielhollas]

           set: |
               *.platform=linux/amd64
               *.output=type=registry,push-by-digest=true,name-canonical=true
               *.cache-from=type=local,src=/tmp/.buildx-cache
               *.cache-to=type=local,mode=max,dest=/tmp/.buildx-cache-new
           files: |
               docker-bake.hcl
               build.json

     # Temp fix for issue of fast size grow in local caching:
     # https://github.com/docker/build-push-action/issues/252
     # https://github.com/moby/buildkit/issues/1896
     - name: Move cache
       run: |
         rm -rf /tmp/.buildx-cache
         mv /tmp/.buildx-cache-new /tmp/.buildx-cache

Could you give it a try on caching? This may further speed the build?

Originally posted by @unkcpz in #439 (comment)

[danielhollas]

Looks like a simpler solution is now available that uses GHA cache directly

https://github.com/restatedev/restate/pull/492/files

See also documentation here:
https://docs.docker.com/build/ci/github-actions/cache/

[danielhollas]

Might not be so easy in the end:
docker/bake-action#87

[unkcpz]

Yep. I did a try in https://github.com/pspgen/build-machine/blob/478dbcebdc521d916f2c72f0500f67898d2a9f13/.github/workflows/ci.yml#L55-L73 ;) which borrow most of the idea from your PR. The build of my image takes 10 mins, using cache safe me half day at least 😄

[danielhollas]

So just to followup here, the cache works only partially. I suspect there is some cache-trashing since we're building multiple images and multiple platforms. So the cache wins us a bit, but could be much better. Perhaps worth looking into more in the future.

This issue is probably relevant docker/bake-action#87 (note the last comment by Simon)