persist connection info from docker container

I'd like to use the docker container and persist the data such that I don't have to add my connection info to Postgres every time I restart it. How can I do this?

Here's a more explicit list of what I'm doing:

1) Run the image as directed:

  docker run -p 5050:80 \

  -e "PGADMIN_DEFAULT_EMAIL=user@domain.com" \

  -e "PGADMIN_DEFAULT_PASSWORD=SuperSecret" \

  -d dpage/pgadmin4

2) Visit http://localhost:5050

3) I'm asked to login, which I do using those environment variables, which works

4) I see the pgAdmin website interface, and I must choose "Add New Server" to access my server, and input my host, port, username, password, every time. I don't want to repeat this. I'd like the connection information to remain.

There are instructions on that same https://hub.docker.com/r/dpage/pgadmin4/ page that suggest to use this line as part of the docker command:

3) I'm shown an error:

  Internal Server Error

  The server encountered an internal error or misconfiguration and was unable to complete your request.

  Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

  More information about this error may be available in the server error log.

I finally figured out how to see the output of the docker logs to see what was going on. It was complaining it had no access to /var/lib/pgadmin/sessions, a directory which didn't exist. After I created it, and refreshed my browser, the logs showed an error about the /var/lib/pgadmin/storage directory not existing. Progress! So I created that one manually. But now I'm stuck. Obviously I don't want to do this forever... I need to give some permissions so it can do what it needs. Here's the error message I'm left with when I tail/follow the docker logs:

OperationalError: (sqlite3.OperationalError) unable to open database file

Any ideas?

Thanks!

Ty