[server] allow prevent merge on failed prebuilds

[svenefftinge]

Introduces an option to make the commit checks pass on the status of the prebuild, i.e. allows to prevent merging a PR when a prebuild failed.

fixes #7518

Release Notes

[GitHub] Optionally prevent merging pull requests when prebuilds fail.

Documentation

https://github.com/gitpod-io/website/pull/1446

[codecov]

Codecov Report

Merging #7535 (55ec837) into main (e7b0e0a) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main   #7535   +/-   ##
=====================================
  Coverage   9.53%   9.53%           
=====================================
  Files         18      18           
  Lines       1080    1080           
=====================================
  Hits         103     103           
  Misses       976     976           
  Partials       1       1           

Flag	Coverage Δ
components-gitpod-cli-app	9.53% <ø> (ø)

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[JanKoehnlein]

Looking at this now 👀

[JanKoehnlein]

/lgtm

Codewise. Couldn't test it as I was unable to get the GitHub app installed in a preview env (internal conversation).

[roboquat]

LGTM label has been added.

Git tree hash: d607e1a58bff842c6a18796bdf73bbc9ba074eb2

[roboquat]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JanKoehnlein

Associated issue: #7518

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Needs approval from an approver in each of these files:

• components/gitpod-protocol/OWNERS [JanKoehnlein]
• components/server/OWNERS [JanKoehnlein]

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