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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