Do ARM64 builds

[mrsimonemms]

Is your feature request related to a problem? Please describe

Create an ARM64 version of the image so that Macs are supported natively.

Describe the behaviour you'd like

Add linux/arm64 to the platform options in the build. For speed, this should only be on builds on the main branch - anything built on any other branch should just build the linux/amd64 image only.

Describe alternatives you've considered

Additional context

Discussion

[bgervan]

Multiarch is not supported
https://github.com/bgervan/devcontainers/actions/runs/5370629981/jobs/9742844492

[2023-06-25T15:58:46.487Z] Start: Run: docker buildx build --platform linux/amd64,linux/arm64 --load --build-arg BUILDKIT_INLINE_CACHE=1 -f /tmp/devcontainercli-runner/container-features/0.46.0-1687708726473/Dockerfile-with-features -t ghcr.io/bgervan/devcontainers/base:2023-06-25 -t ghcr.io/bgervan/devcontainers/base:latest --target dev_containers_target_stage --build-arg _DEV_CONTAINERS_BASE_IMAGE=dev_container_auto_added_stage_label /home/runner/work/devcontainers/devcontainers/base/.devcontainer [2023-06-25T15:58:46.667Z] ERROR: docker exporter does not currently support exporting manifest lists

But maybe there are solutions, didn't check yet

[bgervan]

Maybe with this approach for pushing the images
https://stackoverflow.com/questions/75872905/building-both-amd64-and-arm64-with-github-workflows-from-different-files

[mrsimonemms]

I think I fixed it by playing with the devcontainer commands and adding the --push command. It's built as a multiarch image, so the docker pull command will be the same for both AMD64 and ARM64

[shyim]

I can recommend https://buildjet.com/for-github-actions and then splitting into two jobs and merging it in one job afterwards