devcontainer ci image cache is never working

[crimsonvspurple]

In dc github action I have

 - name: Dev Container Build and Run Action
 uses: devcontainers/ci@v0.3
 with:
 imageName: ghcr.io/${{ github.repository_owner }}/devcontainers
 imageTag: latest
 runCmd: |
 mvn --version
 whoami
 ls -lash /home/vscode
 echo "Dev Container can start up! Let's push!"

this builds and pushes the DC.

In deploy github action I have:

 - name: Dev Container Build and Run Action
 uses: devcontainers/ci@v0.3
 with:
 imageName: ghcr.io/${{ github.repository_owner }}/devcontainers
 cacheFrom: ghcr.io/${{ github.repository_owner }}/devcontainers
 # platform: linux/amd64,linux/arm64
 push: never
 runCmd: |
 whoami
 ls -lash /home/vscode/
< then a lot more things>

This always rebuilds the container instead of loading it from cache.

What am I doing wrong?

[sebst]

See #299 #300

[neilenns]

Has anyone actually managed to get this to work recently? I've read both the above issues and the blog post and still cannot get this to work in my CI workflow. I notice the repo linked in the blog post does not actually show using the caching either.

I'm trying to build a devcontainer image that is then used by the repo's docker-compose.yaml to set up a multi-container development environment. The files to build the apps (primary) image are under .devcontainer/apps:

It builds perfectly fine in CI, but I cannot get caching to work at all:

 - name: Build dev container
 if: steps.changed-files.outputs.devcontainer_any_changed == 'true'
 uses: devcontainers/ci@v0.3
 with:
 imageName: ghcr.io/${{ github.repository }}-devcontainer
 cacheTo: type=registry,ref=ghcr.io/${{ github.repository }}-devcontainer:cache
 configFile: .devcontainer/apps/devcontainer.json
 refFilterForPush: refs/heads/main
 push: filter

This results in:

[2025-04-21T15:04:18.609Z] ERROR: Cache export is not supported for the docker driver.
 Switch to a different driver, or turn on the containerd image store, and try again.
 Learn more at https://docs.docker.com/go/build-cache-backends/

My CI runs on ubuntu-latest