PassFile in docker compose?

I'm trying to use docker compose to spin up postgres and pgAdmin services, and the only sticking point is a minor one: I can't seem to get the PassFile to work.

I wonder if it's not possible because of the following note at the bottom this page of the pgAdmin docs https://www.pgadmin.org/docs/pgadmin4/4.23/server_dialog.html:

```

Note

The password file option is only supported when pgAdmin is using libpq v10.0 or later to connect to the server.
```