Manage issue labels from a configuration in git

[cornelius]

Managing consistent labels across repositories is cumbersome in the UI. This can be done better by having some kind of version-controlled configuration of the labels in git (as a yaml file or something like that) and use the GitHub API to update labels. This can be particular useful for managing descriptions and colors in a consitsten way.

Such automation has to take into account to not remove labels from existing issues when modifying label attributes.

This is a follow up to ADR-24.

[mergeable]

There has not been any activity in the past month. Is there anything to follow-up?

[cornelius]

In place for unit-e.

[cornelius]

WIP for the other repos: https://github.com/cornelius/unit-e-docs/tree/labels