Workflows: Don't allow merge if pr in lockdown

[edvilme]

There are several situations where we do not want to merge PRs (ie, branch lockdown or "DO NOT MERGE" labels). This adds an extra check to ensure that PRs are not merged in this cases.

[Forgind]

Can we make this a required check?

I can still merge over it if I want.

[edvilme]

Can we make this a required check?

I can still merge over it if I want.

I will look into that, but I think that is managed from the repo's settings, although I may be mistaken. Additionally, I updated it to only trigger on label/unlabel to avoid unnecessary runs :) Update, I think it is important for the check to run on every commit too.

[marcpopMSFT]

@edvilme I added the label check as a required check in main if you want to test it.

[edvilme]

@edvilme I added the label check as a required check in main if you want to test it.

Yes, it now shows as required, thanks!!

[edvilme]

/backport to release/8.0.1xx

[github-actions]

Started backporting to release/8.0.1xx: https://github.com/dotnet/sdk/actions/runs/13251599445

[github-actions]

@edvilme an error occurred while backporting to "release/8.0.1xx", please check the run log for details!

The process '/usr/bin/git' failed with exit code 1