Add user authentication support to archive_sync command as well

[hnousiainen]

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About this change - What it does

The previous modification, 8c1c2b0e0cb75f9411d4ea2317f006e0e6909d57, added support for user authentication on the local webserver but missed archive_sync command.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.87%. Comparing base (5505b86) to head (f3dc736). Report is 31 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #629      +/-   ##
==========================================
- Coverage   91.01%   90.87%   -0.14%     
==========================================
  Files          31       31              
  Lines        4917     5020     +103     
==========================================
+ Hits         4475     4562      +87     
- Misses        442      458      +16     

Files with missing lines	Coverage Δ
pghoard/archive_sync.py	86.88% <100.00%> (+0.36%)	:arrow_up:

... and 7 files with indirect coverage changes