Push existing builds to Modrinth

[OffBy0x01]

Hey!

Love this utility - it's great for tweaking mods to add better cross-compatibility. I've recently been using it to add support for adastra metals to tinkers construct.

However, I notice the builds are only available on CurseForge? I'd love to see them released on Modrinth - it has a much nicer pack building experience.