Publish CI builds to their own channel

[AArnott]

• Test that in-app update checks and downloads use the channelname.txt file.
• Verify that main CI builds do indeed trigger the CI release pipeline.

[codecov-commenter]

Codecov Report

Merging #37 (5b633df) into main (a1ab132) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
- Coverage   37.94%   37.89%   -0.06%     
==========================================
  Files          50       50              
  Lines        2264     2267       +3     
==========================================
  Hits          859      859              
- Misses       1405     1408       +3     

Impacted Files	Coverage Δ
src/MoneyMan.WPF/App.xaml.cs	0.00% <0.00%> (ø)
...nk.MoneyManagement/ViewModels/DocumentViewModel.cs	82.78% <0.00%> (ø)

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