Now the problem is: "ERROR r2d2: unable to open database file: /usr/src/app/db/nostr.db"
Sounds like the container can't write to your data folder on the host.
Directions on https://sr.ht/~gheartsfield/nostr-rs-relay/ demonstrate how to make a mounted directory writeable w/ podman.
Or you can YOLO it and try "chmod 777 data".
Make sure your pwd (present working directory) is where you want the data folder to be on your host system sounds like you didn’t have permissions