Booksonic Documentation should have Java options added.

[maximuskowalski]

Like the airsonic documentation, booksonic should have the Java options included in the docs.

This part from the application setup...

Extra java options can be passed with the JAVA_OPTS environment variable, eg -e JAVA_OPTS="-Xmx256m -Xms256m". For some reverse proxies, you may need to pass JAVA_OPTS=-Dserver.use-forward-headers=true for airsonic to generate the proper URL schemes.

as well as the compose and CLI examples.

- JAVA_OPTS=<options> #optional