Support gzdev_project_name parameter

[j-rivero]

The PR adds a new gzdev_project_name parameter to configuration available for jobs using this action.

• If the parameter is not set, the current behaviour is preserved (install the stable repository). That should make migration comfortable.
• If the parameter is set with a given project (i.e: ignition-transport) then the job installs gzdev tool, extract the major version of the software, and use it together with the parameter (i.e: ignition-transport9) to pass that to gzdev repository enable that should handle if that project requires stable, pre-release or nightly and install repositories according.

This PR includes the change in #11 that should go before in order to get a clear history of changes.

Testing:

• Configuration for ignition-transport9 on my own fork
• Github action running this PR: https://github.com/j-rivero/ign-transport/runs/882235580

[j-rivero]

Test run https://github.com/j-rivero/ign-transport/runs/896323621. The changes in 5a0c3f5 should convert any repository name (including sdformat) into a valid entry for gzdev.

[chapulina]

The changes in 5a0c3f5 should convert any repository name (including sdformat) into a valid entry for gzdev.

Thanks for that, I played a bit with bash string substitution and failed miserably 😬