Create Invalidations.yml

[ranocha]

This is the default setup we use in the trixi-framework

[codecov[bot]]

Codecov Report

Merging #77 (3ef73c1) into main (48b7a95) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #77   +/-   ##
=======================================
  Coverage   96.64%   96.64%           
=======================================
  Files          20       20           
  Lines        2296     2296           
=======================================
  Hits         2219     2219           
  Misses         77       77           

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[jlchan]

Thanks!