potiuk opened a new pull request, #38231:
URL: https://github.com/apache/airflow/pull/38231

   We left a little duplication of the code that has been used to build images 
in "Build Images" workflow - that is run as "Pull request target" workflow - 
mainly because of the security concerns and the way how we are replacing the 
source for actions, workflows and CI scripts from the incoming PRs with the one 
coming from the target branch.
   
   This change moves parts of the code that was used to replace the scripts to 
the shared workflows and removes the composite actions that we used in the past 
as common code.
   
   As part of that change it turned out that there was a bug in 
target-commit-sha usage for PRs coming from the forks where rather than using 
the merge commit, we were using the original commit coming from the fork. This 
was the reason why often we asked the users to rebase their PRs where some new 
breaking changes were added in the workflows or new dependencies added. With 
using merge commit, we should be experiencing the "please rebase to take into 
account the latest version of CI or Airflow" far less frequently.
   
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