MySQL/MariaDB with socket

[blizzard4591]

Dear Papermerge team,

I am trying to set up Papermerge with a MariaDB backend, following this.

My setup has a DB instance available via socket that I usually mount via a docker volume mount.
I tested various usual ways of passing the socket through the DB url (?socket=, ?unix_socket=, user:pass@/path/to/socket.sock), but none worked.
Can you give some guidance on what configuration needs to be used for Papermerge?