ci: add support for actionlint

[yfodil]

Description of your changes

Fixes #

I have:

• Read and followed Crossplane's contribution process.
• Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@          Coverage Diff           @@
##             main    #152   +/-   ##
======================================
  Coverage        ?   0.00%           
======================================
  Files           ?     476           
  Lines           ?   60460           
  Branches        ?       0           
======================================
  Hits            ?       0           
  Misses          ?   60460           
  Partials        ?       0           

Flag	Coverage Δ
unittests	0.00% <ø> (?)

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