you can leverage the entrypoint

if you add a little bash scrip and mount it on that directory on the container, it will install whatever you want

It kinda worked like that but for some reason it forces atlantis to request for additional parameters:

Configuration complete; ready for start up
Error: --gh-user/--gh-token or --gh-app-id/--gh-app-key-file or --gh-app-id/--gh-app-key or --gitlab-user/--gitlab-token or --bitbucket-user/--bitbucket-token or --azuredevops-user/--azuredevops-token must be set

However, if I do a separated entrypoint script, it installs as expected. I just to fix the PATH so atlantis user can actually run gcloud