chore: add pkg-pr-new workflow

[userquin]

@antfu do we need to install the app?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.00%. Comparing base (46f6cee) to head (5a927b4).
⚠️ Report is 26 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #142       +/-   ##
===========================================
- Coverage   93.54%   59.00%   -34.54%     
===========================================
  Files          25       56       +31     
  Lines        1797     2898     +1101     
  Branches      335      748      +413     
===========================================
+ Hits         1681     1710       +29     
- Misses        115      933      +818     
- Partials        1      255      +254     

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