feat: detect google cloud run / job

[ilbambino]

Add Cloud Run and Cloud Run jobs to the list of known providers. Using the env vars documented in:
https://cloud.google.com/run/docs/container-contract#jobs-env-vars

resolves #160

[pi0]

Thanks for the PR. I have updated only to omit strong ci: true indicators

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.51%. Comparing base (5558f03) to head (9340b9a).
⚠️ Report is 34 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@ ## main #161 +/- ## ========================================== - Coverage 82.08% 73.51% -8.57%  ========================================== Files 10 10 Lines 374 219 -155 Branches 33 31 -2 ========================================== - Hits 307 161 -146  + Misses 61 53 -8  + Partials 6 5 -1 

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