Add github action to build release tags (#3449)
* Build release tags of the spec
* Update .github/workflows/main.yml
Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
* Move historical (future old) job out to its own thing
* Update for new baseurl setup
* Use hugo config overrides instead
* Remove mistakenly re-added matrix.org poke
* Restore npm stuff to main branch representations
* [2] Restore npm stuff to main branch representations
* Update .github/workflows/main.yml
Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
