initial version for release action

[kwin]

This requires the following organisation or repository secrets:

1. GPG_PRIVATE_KEY, the private key for signing the release
2. GPG_PASSPHRASE, the passphrase for using the private key
3. OSSRH_TOKEN_USER, the user name of a user for OSSRH for deploying to Maven Central, https://central.sonatype.org/publish/publish-guide/
4. OSSRH_TOKEN_PASSWORD, the token of a user for OSSRH for deploying to Maven Central, should be created via https://oss.sonatype.org/#profile;User%20Token. Used instead of password to decouple from the named user's credentials.

@davidjgonzalez Can you set those up?

[codecov[bot]]

Codecov Report

Merging #2683 (53d1983) into master (bfe1c01) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2683   +/-   ##
=========================================
  Coverage     53.85%   53.85%           
  Complexity     5568     5568           
=========================================
  Files           753      753           
  Lines         30593    30593           
  Branches       3961     3961           
=========================================
  Hits          16477    16477           
  Misses        12575    12575           
  Partials       1541     1541           

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[kwin]

@davidjgonzalez Please set up OSSRH credentials as repo/orga secrets otherwise no one apart from you will ever be able to create releases.