You need the following environment variables in order to run all tests:
TMDB_API_KEY
TMDB_API_READ_TOKEN
TMDB_API_ACCESS_TOKEN
TMDB_USERNAME
TMDB_PASSWORD
TMDB_ACCOUNT
Most are easy to get via TMDB but TMDB_API_ACCESS_TOKEN is tricky. See UniversalMediaServer/UniversalMediaServer#4037 (comment) for instructions.
Run mvn deploy -P release.
You can use the gpg.keyname property in the Maven settings.xml to specify which GPG key to use to sign the files, as described at https://central.sonatype.org/publish/requirements/gpg/#listing-keys
On macOS you might need to symlink gpg2 to gpg as described at https://stackoverflow.com/a/69920288/2049714