CI may have been checking out development even though it was
doing everything else for release branch so when tags were applied
it was applied on the wrong branch.
Development and master should have been near the same except for
release bump.
Hard setting the checkout to the proper branch should fix this.
Closes: https://github.com/netbootxyz/netboot.xyz/issues/1294
With the recent changes to Travis CI, it seemed
like a good time to begin porting netboot.xyz CI
over to Github Actions to keep everything in on
place. These are the changes for the main
netboot.xyz repo.
