Push in quay.io/buildah/stable

Start with the devcontainer build command path that handles --docker-path, --push, and BuildKit validation, then reproduce the reported command in quay.io/buildah/stable. Determine whether pushing with Buildah is supported and document or implement the expected behavior; done when the reported command works or the limitation is clearly surfaced and tested.

Hey! I'm trying to build and push (to gitlab registry) my project in quay.io/buildah/stable build container.
The build works fine when i do:
devcontainer build --docker-path buildah --workspace-folder . --image-name $FQ_IMAGE_NAME

But it fails when I add --push true as:
devcontainer build --docker-path buildah --workspace-folder . --push true --image-name $FQ_IMAGE_NAME

with this error:

[2024-06-28T09:56:10.009Z] @devcontainers/cli 0.65.0. Node.js v20.12.2. linux 6.6.33-0-virt x64.
Error: --platform or --push require BuildKit enabled.
    at mtA (/usr/local/lib/node_modules/@devcontainers/cli/dist/spec-node/devContainersSpecCLI.js:466:363)
    at async Pm (/usr/local/lib/node_modules/@devcontainers/cli/dist/spec-node/devContainersSpecCLI.js:465:1856)
    at async FrA (/usr/local/lib/node_modules/@devcontainers/cli/dist/spec-node/devContainersSpecCLI.js:662:24692)
    at async yrA (/usr/local/lib/node_modules/@devcontainers/cli/dist/spec-node/devContainersSpecCLI.js:662:22435)
{"outcome":"error","message":"--platform or --push require BuildKit enabled.","description":"--platform or --push require BuildKit enabled."}

My CI looks like:

container build and push:
  stage: container-build
  image: quay.io/buildah/stable
  variables:
    # Use vfs with buildah. Docker offers overlayfs as a default, but Buildah
    # cannot stack overlayfs on top of another overlayfs filesystem.
    STORAGE_DRIVER: vfs
    # Write all image metadata in the docker format, not the standard OCI format.
    # Newer versions of docker can handle the OCI format, but older versions, like
    # the one shipped with Fedora 30, cannot handle the format.
    BUILDAH_FORMAT: docker
    BUILDAH_ISOLATION: chroot
  before_script:
    # GitLab container registry credentials taken from the
    # [predefined CI/CD variables](../variables/index.md#predefined-cicd-variables)
    # to authenticate to the registry.
    - echo "$CI_REGISTRY_PASSWORD" | buildah login -u "$CI_REGISTRY_USER" --password-stdin $CI_REGISTRY
    # install devcontainer
    - dnf install -y nodejs npm python3 make g++
    - npm install -g @devcontainers/cli
  script:
    - devcontainer build --docker-path buildah --workspace-folder . --push true --image-name $FQ_IMAGE_NAME

Does devcontainer only support docker when --push? Or is there some other way to get around this issue?
For now I'll try to use podman and report back.

Thank you for your work btw.