Head branch is not sent for forks

[timja]

https://github.com/jenkinsci/github-checks-plugin/pull/226/files#r785288753

Just tested via unit tests

[codecov]

Codecov Report

Merging #237 (0a030fe) into master (9efc8d6) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #237      +/-   ##
============================================
+ Coverage     80.19%   80.30%   +0.11%     
- Complexity      168      169       +1     
============================================
  Files            16       16              
  Lines           520      523       +3     
  Branches         47       48       +1     
============================================
+ Hits            417      420       +3     
  Misses           81       81              
  Partials         22       22              

Impacted Files	Coverage Δ
...ugins/checks/github/CheckRunGHEventSubscriber.java	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9efc8d6...0a030fe. Read the comment docs.

[jglick]

Any idea why it is not present?

[timja]

Any idea why it is not present?

https://docs.github.com/en/rest/reference/checks#suites

Note: The Checks API only looks for pushes in the repository where the check suite or check run were created. Pushes to a branch in a forked repository are not detected and return an empty pull_requests array and a null value for head_branch.