add github actions example

[ksurl]

using auth with custom url (selfhosted) ntfy server.

[codecov-commenter]

Codecov Report

Base: 66.04% // Head: 66.04% // No change to project coverage 👍

Coverage data is based on head (b103caf) compared to base (a43a4ae).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #492   +/-   ##
=======================================
  Coverage   66.04%   66.04%           
=======================================
  Files          35       35           
  Lines        3723     3723           
=======================================
  Hits         2459     2459           
  Misses        910      910           
  Partials      354      354           

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