Create Github Actions workflow for the ontology

[prjemian]

Repository is now created. We'll need a script (Github Actions workflow) to create the new content and a to push it to the main branch on https://github.com/nexusformat/NeXusOntology. Also, the script should create a matching tag on the new repo for any new tag here that starts with the letter v (signifying a new tagged release of the NeXus definitions). We should avoid tags with rc in the name since these mark release candidates and are not final releases.

Originally posted by @prjemian in #922 (comment)

[prjemian]

Creation of the new tags was completed in #1099.

Pushing to the new repo and Tagging have not been done yet.

[prjemian]

@PeterC-DLS I suggest this will not be complete for the 2022.06 release of definitions. We should move it to the next milestone.

[prjemian]

Moved.