[Feature Request] Link checker in pipeline

[cah-hbaum]

Coming from this PR and this issue, @artificial-intelligence suggested that we should probably include a link checker to combat potential Link Rot in our standard documents.

[mbuechse]

@cah-hbaum maybe you can copy/adapt this: https://github.com/SovereignCloudStack/docs/blob/main/.github/workflows/link-validator.yml

[artificial-intelligence]

I also have implemented something similar before, you might want to check osism/osism.github.io@3b5cf94 (it's similar to the above solution posted)

[martinmo]

We already have https://github.com/SovereignCloudStack/standards/blob/main/.github/workflows/link-validator.yml, which even runs on a regular schedule.

Maybe it is a configuration issue: check-modified-files-only: 'yes' is set unconditionally, but for the scheduled runs this doesn't make sense.

[martinmo]

Yes, if I compare a scheduled run vs. a run triggered by push, the scheduled run is missing this

From https://github.com/SovereignCloudStack/standards
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
=========================> MARKDOWN LINK CHECK <=========================

[✔] All links are good!

=========================================================================

and instead just prints

From https://github.com/SovereignCloudStack/standards
 * branch            main       -> FETCH_HEAD
All good!

which makes me think nothing is checked at all in this case.

(Unfortunately it doesn't show more details, e.g., number of files checked.)