This template can be used to extend one of the global images used in RenkuLab or to extend an image that was built from a user's code repository.
Replace the source image in the FROM line of the Dockerfile to point to the image you
want to extend. Specify additional packages to be installed by apt directly in the Dockerfile
and/or add additional Python packages to the requirements.txt.
When you make a chance in the repository, the GitHub action (from .github/workflows/build.yaml)
will automatically create a new image. You can find it under "packages" of the repository and use it
directly in a Renku "External image" session launcher.