Commits on Nov 16, 2021

1. Size reports: Fix parent SHA race …

   #### Problem
   
   For a GitHub PR, the actual parent may be different from the commit
   given by `github.event.pull_request.base.sha` (see
   actions/checkout#27). In this case, size
   reports incorrectly include changes from commit(s) between the purported
   and actual parent.
   
   #### Change overview
   
   Extract the actual parent from the PR merge commit subject.
   
   #### Testing
   
   Manually checked externally
       https://github.com/kpschoedel/actiontest/runs/4226639507
   Actual confirmation can only happen on live CI runs.

   

   kpschoedel committed Nov 16, 2021
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2. set $GH_EVENT_PARENT before gh_sizes.py runs

   

   kpschoedel committed Nov 16, 2021
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3. Use test instead of [[

   

   kpschoedel committed Nov 16, 2021
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4. POSIX test

   

   kpschoedel committed Nov 16, 2021
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