various CI improvements

[ArnoStrouwen]

Adds typical SciML CI scripts.

[codecov]

Codecov Report

Attention: Patch coverage is 28.94737% with 27 lines in your changes are missing coverage. Please review.

Project coverage is 31.11%. Comparing base (257acb8) to head (ff08766).
Report is 3 commits behind head on main.

Files	Patch %	Lines
src/FindFirstFunctions.jl	28.94%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #15       +/-   ##
==========================================
+ Coverage   0.00%   31.11%   +31.11%     
==========================================
  Files          1        1               
  Lines         43       45        +2     
==========================================
+ Hits           0       14       +14     
+ Misses        43       31       -12     

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