Link to the f-droid repos for anyone who might want them :)
Regular: https://f-droid.org/packages/net.thunderbird.android/
Beta: https://f-droid.org/packages/net.thunderbird.android.beta/
Took me a moment to figure out why there are three repos, but one of them is from where they've updated the branding and description for K-9 mail ๐