Run the nightly CI tests on the release branch

[pallavisontakke]

, e.g. 2.18.x

[pallavisontakke]

#7628 is the tentative PR for this.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.30%. Comparing base (59f50f2) to head (3bc5897).
Report is 718 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7628      +/-   ##
==========================================
+ Coverage   80.06%   81.30%   +1.24%     
==========================================
  Files         190      240      +50     
  Lines       37181    44700    +7519     
  Branches     9450    11159    +1709     
==========================================
+ Hits        29770    36345    +6575     
- Misses       2997     3964     +967     
+ Partials     4414     4391      -23     

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[svenklemm]

Release branch should be determined programmatically, not hard coded