CI: simplify groups ref/pointer

[Borda]

What does this PR do?

reduce duplicated sections which are sensitive for human error and improve readability

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[akihironitta]

This will be very nice if it works!

[carmocca]

Blocking until I verify if this works! Thanks for the suggestion

[Borda]

This will be very nice if it works!

in theory, it should, as it is using YAML native directive/syntax

BUT it seems that with this, the referred lists are loaded as sublists, so not expanded as a single flattened list :(

import yaml
from rich import print

with open(".github/checkgroup.yml") as fh:
    config = yaml.safe_load(fh)

print(config)

[carmocca]

I checked and we use https://probot.github.io/api/7.0.1/classes/context.html#config to load the configuration file. There's no mention of any specific parsing constraints so I assume it will work just as yaml.safe_load()

Looking at https://stackoverflow.com/questions/24090177/how-to-merge-yaml-arrays, it looks like flattening these list is not possible.

The only solution I can think of is adding support for flattening in the javascript implementation of checkgroup so that we can use this notation: https://github.com/Lightning-AI/probot/blob/babecd77266ed8ac540de7f5e17804030174215c/src/check-group/utils/user_config_parser/populate_subprojects.ts#L63-L91

[Borda]

The only solution I can think of is adding support for flattening in the javascript implementation of checkgroup

Let's keep it simple, personally, it may be good to be by default flatten all lists in check and paths as there is no meaning for a tree, but if it is not a few clicks away, let's drop it for now 🐰