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 76.76%. Comparing base (ba3ac2c) to head (67cc904).
⚠️ Report is 62 commits behind head on jazzy.

Additional details and impacted files

@@           Coverage Diff           @@
##            jazzy     #422   +/-   ##
=======================================
  Coverage   76.76%   76.76%           
=======================================
  Files          29       29           
  Lines        1945     1945           
  Branches      114      114           
=======================================
  Hits         1493     1493           
  Misses        379      379           
  Partials       73       73           

Flag	Coverage Δ
unittests	76.76% <ø> (ø)

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