Run w/o --link, but use localhost PG instance

[neillindberg]

I'm having success loading the GUI after using this run command (with and w/o the extra port mapping):
docker run --name local-pgadmin4 -p 5050:5050 -p 5432:5432 -d fenglc/pgadmin4

But, I have PostgreSQL running on bare metal and I'd like to keep it that way. Can I use this with PG running on bare metal? Clue(s)?

Thank you.