Handle Postgres connection when running in Cloud Run

[stdavis]

This was all working great on my local machine but failed to connect to the database when I pushed it as a cloud function. This PR branches the engine creation method based on the runtime environment.

Ref: https://cloud.google.com/sql/docs/postgres/connect-functions

[codecov]

Codecov Report

Base: 91.56% // Head: 91.18% // Decreases project coverage by -0.38% ⚠️

Coverage data is based on head (4006ea9) compared to base (302ac9b).
Patch coverage: 57.14% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
- Coverage   91.56%   91.18%   -0.39%     
==========================================
  Files           6        6              
  Lines         688      692       +4     
  Branches       91       92       +1     
==========================================
+ Hits          630      631       +1     
- Misses         52       54       +2     
- Partials        6        7       +1     

Impacted Files	Coverage Δ
src/palletjack/loaders.py	87.62% <57.14%> (-1.27%)	⬇️

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[jacobdadams]

@stdavis, the new version has been uploaded to pypi.

[steveoh]

@jacobdadams I wrote this for sweeper if you want to crib it to automate publishing to pypi. https://github.com/agrc/sweeper/blob/main/.github/workflows/python.yml