ci: use action to validate dependabot.yml

[thehowl]

following this comment from @kristovatlas

This action seems to only validate the JSON schema. For full validation, it's on GitHub to provide this -- tracked in this issue: dependabot/dependabot-core#4605

[github-actions]

✅dependabot config looks good 👍

[thehowl]

Actually, awful. I don't want this as a comment. I'll see if it can be improved somehow by just having the CI check instead.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (846956f) 56.50% compared to head (d22273c) 56.10%.
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1642      +/-   ##
==========================================
- Coverage   56.50%   56.10%   -0.41%     
==========================================
  Files         439      439              
  Lines       66559    66214     -345     
==========================================
- Hits        37608    37148     -460     
- Misses      26026    26173     +147     
+ Partials     2925     2893      -32     

Flag	Coverage Δ
go-1.21.x	∅ <ø> (∅)
misc	∅ <ø> (∅)
misc-_test.genstd	∅ <ø> (∅)

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[kristovatlas]

Thanks for giving it a shot even though you're not digging the comment feature!

[thehowl]

Thanks for giving it a shot even though you're not digging the comment feature!

This is fixed, with the new commits it now just makes the CI red :)

[zivkovicmilos]

I think there is some automated check that GitHub does for Dependabot changes, but it's not an active CI check on the PR itself, so this looks good 💯