build: only require docs 'Added' fixes for release
Discovered while trying to do a test
build for #12957. There are Added:
tags without versions in the docs on master
so it's borking on build. Test builds use the DISTTYPE
of "custom"
which isn't allowed through here, like "nightly"
is. So I've inverted the logic since "release"
would be the only DISTTYPE
(also the default if you don't set one) that's allowed through.
/cc @nodejs/build