Initial version of the gh-action ready for release

[epijim]

Primary aims in this release:

• - Run R CMD check (check installation)
• - Run covr::package_coverage() (check unit test coverage)
• - Run covtracer (link documentation to unit tests)
• - Place results into pdf report
• - User can have this report automatically appended to a release tag

This is tracked in meta-issue #8, and this milestone

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This discussion was created from the release Initial version of the gh-action ready for release.