feat(helm): add value to customise interactive session images (#795)

[mdonadoni]

Closes reanahub/reana-workflow-controller#569

[codecov]

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[tiborsimko]

It may be perhaps good to have also an alias (or a list of aliases) for an image, because currently we would allow opening of docker.io/jupyter/scipy-notebook:notebook-6.4.5 but not the opening of jupyter/scipy-notebook:notebook-6.4.5 which is essentially the same image. Motivation: people often leave out docker.io from the fully-qualified image names.

This could be an issue during the use case of opening a session from the reana-client, such as:

$ rc open -w root6-roofit-snakemake-kubernetes -i jupyter/scipy-notebook:notebook-6.4.5
==> ERROR: Interactive session could not be opened:
Custom container image jupyter/scipy-notebook:notebook-6.4.5 is not allowed.

Since the docker.io prefix is kind of unique, due to Docker history, there may not be many more examplees calling for image aliases out there... So perhaps the best solution is not to alter the YAML configuration file with aliases after all, but rather to solve this command-line use case on the application level, e.g. try to add leading docker.io/ if the image name supplied by the user does not start with it, when trying to match the user-supplied value against the list of available images.

[mdonadoni]

Done in reana-workflow-controller, the alias prefixes I have considered are:

• docker.io/
• docker.io/library/
• library/

[mdonadoni]

This means that ubuntu:24.04, library/ubuntu:24.04, docker.io/library/ubuntu:24.04 are all going to work well