* Add Ruby support (no download support yet)
Currently only pre-existing Rubies are used, although the code will
search for and consider multiple versions. This allows a hook to require
3.4.7 when the default system Ruby is 3.4.6, but RVM (or a similar tool)
has installed 3.4.7. If a suitable Ruby cannot be found, the user is
prompted to install one manually and re-run.
Hooks get an isolated GEM_HOME, based on the hook repository, any
additional_dependencies, and the interpreter version/path. Any Ruby
upgrade would therefore re-install the gems to ensure that stale
versions aren't used. Repository gem dependencies are installed based on
the included gemspec files, combined with the additional_dependencies
field.
* Add pins for CI 'install Ruby' action
* Update setup-ruby pin
* Tweak version parsing
* Tweak env vars
---------
Co-authored-by: Jo <10510431+j178@users.noreply.github.com>
