Add action to check builtin consistency

[pfitzseb]

No description provided.

[codecov]

Codecov Report

Merging #541 (cbf40fe) into master (fd31ef3) will decrease coverage by 0.24%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master     #541      +/-   ##
==========================================
- Coverage   85.67%   85.43%   -0.25%     
==========================================
  Files          12       12              
  Lines        2415     2423       +8     
==========================================
+ Hits         2069     2070       +1     
- Misses        346      353       +7     

Impacted Files	Coverage Δ
src/builtins.jl	64.08% <12.50%> (-1.75%)	⬇️

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[KristofferC]

Why should this not be a normal test?

[pfitzseb]

Because generate_builtins.jl only runs on ~nightly, but that fails tests currently and we'd never notice the failure like that. So now I'm running this as a separate action and as part of runtests.jl.