fix: run build prior to release

[johnnyreilly]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: published npm packages have src/ but not lib/ #162
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

This PR adds in a build step to the release.yml so the build artefacts exist for publishing. It also excludes src from publishing as it bloats package size and isn't used.

PR requested here: #147 (comment)

It also ensure vitest doesn't try and run tests in the lib folder.

[codecov-commenter]

Codecov Report

Merging #166 (834cf95) into main (2885cc3) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #166   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            6         6           
  Branches         3         3           
=========================================
  Hits             6         6           

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[JoshuaKGoldberg]

💯 Perfect, thanks @johnnyreilly!

[JoshuaKGoldberg]

@allcontributors add @johnnyreilly for code

[allcontributors]

@JoshuaKGoldberg

I've put up a pull request to add @johnnyreilly! 🎉

[johnnyreilly]

Pleasure!