ci: add workflow that comments changelog preview on PRs

[fengelniederhammer]

Summary

PR Checklist

• [ ] All necessary documentation has been adapted or there is an issue to do so.
• [ ] The implemented feature is covered by an appropriate test.

[fengelniederhammer]

See GenSpectrum/LAPIS#840 for a similar PR that has a current change that causes a comment.

[Taepper]

Shouldn't this already comment that preview on this PR?

[fengelniederhammer]

Shouldn't this already comment that preview on this PR?

There are currently no changes that would trigger a version bump (that's also why there is currently no open version PR in SILO)

[Taepper]

Ah, I thought this was meant to show, what the change log would look like after the current PR is merged

[fengelniederhammer]

Ah, I thought this was meant to show, what the change log would look like after the current PR is merged

Exactly, that's what it does. But this PR doesn't introduce any relevant changes. Maybe the feat in the PR title confused you, I'll remove it - it's a leftover from me testing it.

[Taepper]

Ah, yes that is precisely it! Thanks!