Create a GitHub App that does janitorial work on the tracks

[kytrinyx]

I'm not sure what would be useful, but here are some of the things that I'm considering.

trigger: a PR is submitted that changes a config file
action: run configlet fmt

• submit the difference as a commit to the submitter's branch if allowed (maybe I need to authorize a user-to-server call using my account, because "admin")
• if not allowed to commit, then set a failed status with a link to documentation or something

trigger: the description.md or metadata.yml in problem-specifications changes
action: regenerate the exercise README for all tracks that implement the exercise and submit a pull request

trigger: any of the readme templates change in a track
action: regenerate the exercise READMEs for all the exercises in the track and submit a pull request

trigger: a .meta/description.md or .meta/metadata.yml within an exercise changes
action: regenerate the README for that exercise

[NobbZ]

action: run configlet fmt [and do PR if necessary]

Please use lint to check if fmt is necessary, then we get it for free in CI and the comitter has to take care of it.

trigger: the description.md or metadata.yml in problem-specifications changes
action: regenerate the exercise README for all tracks that implement the exercise and submit a pull request

Please don't. README and exercise might diverge then. This is actually one of the reasons why we put the READMEs into the repository.

trigger: any of the readme templates change in a track
action: regenerate the exercise READMEs for all the exercises in the track and submit a pull request

Reasonable, but should IMHO be done by whomever changes the template.

trigger: a .meta/description.md or .meta/metadata.yml within an exercise changes
action: regenerate the README for that exercise

dito

[NobbZ]

PS: the last 2 items (local changes that make rebuilding READMEs necessary) could even be checked by lint sub command and therefore are easily cover able by CI.

For the remaining item I were happy about a tool which warns me when canonical stuff changes but not force me to pick those changes up right now.

[kytrinyx]

@NobbZ these are good observations. I'm trying to figure out what automation would actually help. I'm not sold on any of the suggestions I've made.

[kytrinyx]

I've thought more about this and agree with @NobbZ that these are not a good approach. I have another idea that I'm going to open an issue for.