Why my Private Spaces app on Container Registry & Runtime ignores heroku.yml

Issue

I have an app in Private Space built on Container Registry & Runtime. The app has one or more Dockerfiles for each process type as well as the heroku.yml file with which the run secion defines commands to be started on each process type.

However, looking into the app logs, it seems that the platform is running the command defined in CMD line on Dockerfile or an empty process that immediately exits with status 0 when CMD is not defined.

Resolution

Unfortunately, Private Spaces doesn't honor the run section in heroku.yml file yet. Instead, the platform looks up the command defined as CMD in Dockerfile. Please define the process to run there.

If there are more than one process type for the app, heroku.yml needs to list corresponding Dockerfiles like:

build:
  docker:
    web: Dockerfile
    worker: Dockerfile.worker

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