Hi there,

i was following this guide to setup our internal environment accordingly:
https://containers.dev/guide/gitlab-ci

This works correctly since the devcontainer.json contains the following part:

  "build": {
    "context": "..",
    "dockerfile": "Dockerfile"
  },

But as soon as i switch this to just referencing an image name instead of an dockerfile in the devcontainer.json, e.g. via:

"image": "mcr.microsoft.com/devcontainers/base:ubuntu-22.04",

The referenced image name via:

devcontainer build --workspace-folder . --push true --image-name ${CI_REGISTRY_IMAGE}:latest

is completly ignored and just some random image name containing a hashes is generated. This block the usage of gitlab-ci, since the resulting image is not pushable to the gitlab registry, since the naming of the docker image does not correspond anymore correctly to the project name. Nevertheless a workaround is at the moment to create a dummy Dockerfile just containing the FROM statement referencing the image name.

But it would be beneficial if the --image-name works for both scenarios ;)

best,
Christian