ref: Tidy up types and remove string coercion

[nicholas-codecov]

This PR adds in a package to give the correct types for GH payload events, as well this PR removes redundant string coercion that's not needed.

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 6 lines in your changes missing coverage. Please review.

Project coverage is 92.92%. Comparing base (943cea1) to head (5694bb0).

Files	Patch %	Lines
src/buildExec.ts	90.90%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1536      +/-   ##
==========================================
+ Coverage   91.66%   92.92%   +1.25%     
==========================================
  Files           5        5              
  Lines         324      325       +1     
  Branches       86       77       -9     
==========================================
+ Hits          297      302       +5     
+ Misses         27       21       -6     
- Partials        0        2       +2     

Flag	Coverage Δ
demo	92.92% <90.90%> (+1.25%)	⬆️
macos-latest	92.92% <90.90%> (+1.25%)	⬆️
script	92.92% <90.90%> (+1.25%)	⬆️
ubuntu-latest	92.92% <90.90%> (+1.25%)	⬆️
version	92.92% <90.90%> (+1.25%)	⬆️
windows-latest	92.92% <90.90%> (+1.25%)	⬆️

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[Swatinem]

Suggested change

	['pull_request', 'pull_request_target'].every(
	(event) => event !== context.eventName,
	)
	!['pull_request', 'pull_request_target'].includes(context.eventName)

similar to below

[nicholas-codecov]

Ahhh yea that would be better ... i spent a hot minute looking at MDN docs trying to figure out the "smart" way ... and all i needed was a ! 🤦