Run workflow on pushes to save cache (backport #420)

[mergify]

See ros-controls/ros2_control_ci#384 for reference

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This is an automatic backport of pull request #420 done by Mergify.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.11%. Comparing base (b927280) to head (97f7a40).
Report is 1 commits behind head on humble.

Additional details and impacted files

@@           Coverage Diff           @@
##           humble     #421   +/-   ##
=======================================
  Coverage   59.11%   59.11%           
=======================================
  Files          28       28           
  Lines        1541     1541           
  Branches      839      839           
=======================================
  Hits          911      911           
  Misses        243      243           
  Partials      387      387           

Flag	Coverage Δ
unittests	59.11% <ø> (ø)

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