Use shared workflows and linter/releaser configs

[ldemailly]

use https://github.com/fortio/workflows to limit dependabot PRs

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.80%. Comparing base (a80e10f) to head (389b427).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
+ Coverage   97.37%   97.80%   +0.42%     
==========================================
  Files           3        2       -1     
  Lines         458      456       -2     
==========================================
  Hits          446      446              
+ Misses          9        7       -2     
  Partials        3        3              

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