Making CI for testing generated proto correctness (backport #1892)

[mergify]

This is an automatic backport of pull request #1892 done by Mergify.
Cherry-pick of 0956d89 has failed:

On branch mergify/bp/v10.x/pr-1892
Your branch is up to date with 'origin/v10.x'.

You are currently cherry-picking commit 0956d893.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   .github/workflows/check-generated.yml
	new file:   contrib/scripts/check-generated.sh

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   chain.schema.json

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[p0mvn]

Let's merge this in, I will close / rebase my other PRs

[ValarDragon]

Thanks! Sorry for the race-condition / overhead there 😅