Update sonarcloud.yml with the condition for this repo instance

[stan-dot]

The sonarcloud workflow requires an auth key, so will not work with PRs from forks, which we want to support. We will therefore skip that job when the PR is from a fork.

thanks @callumforrester

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.56%. Comparing base (cd91f0f) to head (f08748f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #664      +/-   ##
==========================================
- Coverage   92.62%   92.56%   -0.07%     
==========================================
  Files          35       35              
  Lines        1654     1654              
==========================================
- Hits         1532     1531       -1     
- Misses        122      123       +1     

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[callumforrester]

Just to quickly document the reasons: The sonarcloud workflow requires an auth key, so will not work with PRs from forks, which we want to support. We will therefore skip that job when the PR is from a fork.