sign tags so they are verified

[synfinatic]

• add docs on how to release
• automatically push tags

[codecov]

Codecov Report

Merging #582 (ea64ea4) into main (4415620) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #582   +/-   ##
=======================================
  Coverage   82.35%   82.35%           
=======================================
  Files          35       35           
  Lines        3241     3241           
=======================================
  Hits         2669     2669           
  Misses        502      502           
  Partials       70       70           

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