Would it be possible to add an option to disable update checking or at least the message on login? I use the development builds from https://snapshot.discordsrv.com/ but it seems it doesn't always receiving the latest branch changes.

Which leads to this message occurring, despite no newer builds being available.

From console;

[01:09:43] [DiscordSRV - Initialization/WARN]: [DiscordSRV] This build of DiscordSRV is ahead of master but behind develop. Update your development build!

DiscordSRV-Build-1.19.0-SNAPSHOT-1586940538.jar
Downloaded 04/15 01:49 AM PST

snapshot.discordsrv.com has the latest development builds within a couple minutes of a push, you can use the discordsrv.updatenotification permission for disabling the join message. UpdateCheckDisabled can be added to the config but is not recommended for security reasons

Ah, I see it's because the newest commit didn't build.
https://github.com/DiscordSRV/DiscordSRV/runs/586966971

It is still checking for newer commits and saying outdated despite that. Is it possible to check against existing build numbers instead of if newer commits exist?

It does check the latest commit even if it didn't build, building a check that checks for the latest that did build would be very very complicated, thus it will stay this way