Use GitHub action output

[cortadocodes]

Contents (#4)

Enhancements

• Use action output for PR description instead of environment variable

Operations

• Improve action.yaml for GitHub marketplace
• Use latest codecov action
• Improve release workflow

Other

• Update README

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@8a1a3c1). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main       #4   +/-   ##
=======================================
  Coverage        ?   95.67%           
=======================================
  Files           ?        1           
  Lines           ?      162           
  Branches        ?        0           
=======================================
  Hits            ?      155           
  Misses          ?        7           
  Partials        ?        0           

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