Add scheme property to Spoolman to support instances behind https

[ross]

Proposed change

My Spoolman instance runs in docker and is only reachable via https. This PR adds a new scheme property, defaulting to http, and passes it in to URL.build.

Additional information

Had a bit of a time finding a way to verify that https was actually passed through during the test. Lmk if you have cleaner suggestions there.

Checklist

• I have updated the documentation if needed.
• I have updated the tests if needed.

[github-actions]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days. Thank you for your contributions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f5081c3) to head (d73169c).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #271   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          134       135    +1     
  Branches         4         4           
=========================================
+ Hits           134       135    +1     

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