DM-35272: Add optional dependencies for postgres

[mwittgen]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Merging #712 (76e3083) into main (1dd4775) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #712   +/-   ##
=======================================
  Coverage   84.60%   84.60%           
=======================================
  Files         243      243           
  Lines       31916    31916           
  Branches     5990     5990           
=======================================
  Hits        27002    27002           
  Misses       3744     3744           
  Partials     1170     1170           

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[r-owen]

The new extra [postgres] is not working yet.

[r-owen]

Thank you for adding the optional postgres installation option. It seems to work well.

I can't comment on the change to workflows/build.yaml as I don't understand the details, but am happy to assume it's correct.

[r-owen]

(Trying again. the last time this showed up as a comment instead of as a review).

Approved. See previous comment.

[mwittgen]

Thanks. It's uploaded to PyPi now. https://pypi.org/project/lsst-daf-butler/

[timj]

I wasn't expecting you to force a tag build on this one. Waiting until the weekly tomorrow night would have been fine.

[mwittgen]

Sorry, I know creating a tag for this purpose is not ideal.
I try to minimize my mistakes in the future. ;-)