Consider semver build metadata instead of "-v1" suffixes

[focusaurus]

Not sure if how we are using the "-v" suffixes aligns exactly with semver build metadata, but in the spirit of using external standards, I'd point us to point 10 of semver. And I also just think the "v" should be only used strictly as a prefix and everything after it is the version, so having another random "v" in there is weird.