unify Github Actions config

[JakaKokosar]

Match GH actions config with other add-ons. This is just for the sake of consistency.

[codecov-io]

Codecov Report

Merging #42 (68086e5) into master (41b634e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #42   +/-   ##
=======================================
  Coverage   50.20%   50.20%           
=======================================
  Files           5        5           
  Lines         739      739           
=======================================
  Hits          371      371           
  Misses        368      368           

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.20%. Comparing base (41b634e) to head (68086e5).
Report is 35 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #42   +/-   ##
=======================================
  Coverage   50.20%   50.20%           
=======================================
  Files           5        5           
  Lines         739      739           
=======================================
  Hits          371      371           
  Misses        368      368           

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