Do not use gh-hosted-runners-16cores-1 runners on forks

[arthurschreiber]

Description

We (GitHub) and other members of the community maintain our own Vitess fork. We rely on the CI builds to ensure that when we backport changes into our fork, we don't introduce any bugs or other issues.

We only have access to the "normal" runner types, and don't have access to gh-hosted-runners-16cores-1, which is specific to the vitessio organization and I guess is provided by CNCF.

By checking whether a workflow runs in the scope of the vitessio organization, and then deciding between gh-hosted-runners-16cores-1 or the regular ubuntu-latest runners, we can allow workflows to run in forks of the vitess repo as well.

cc @timvaillancourt as you might be interested in this as well.

I'd like to see this backported in all supported branches, as this will make my live considerably easier without having any real impact on the upstream Vitess repository. 😅

Related Issue(s)

N/A

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.40%. Comparing base (3499a77) to head (4110979).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17237      +/-   ##
==========================================
+ Coverage   67.39%   67.40%   +0.01%     
==========================================
  Files        1570     1570              
  Lines      252903   252912       +9     
==========================================
+ Hits       170451   170485      +34     
+ Misses      82452    82427      -25     

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[dbussink]

I thunk we should pin a to a specific known working ubuntu version and not latest. That we do that in other jobs in a mistake imho, we explicitly pinned it in the past to avoid having to scramble when it gets updated.

[arthurschreiber]

I'm okay with that, but I think that should probably go into a separate PR, right? 🤔