honor $SHELL in action/transform

[deadc0de6]

honor $SHELL in action/transform for #465

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.76%. Comparing base (35fac6c) to head (e316263).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #466   +/-   ##
=======================================
  Coverage   90.76%   90.76%           
=======================================
  Files          23       23           
  Lines        4796     4797    +1     
=======================================
+ Hits         4353     4354    +1     
  Misses        443      443           

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