I experienced that installing your Postgres database server on your local machine as a Docker container is not that evident. So this explains how you need to do it and what you need to take into account.
To setup your Postgres Docker container you need to run:
docker run -d -e POSTGRES_USER=postgres -e POSTGRES_PASSWORD=mysecretpassword --name postgres-server -p 5432:5432 -v pgdata:/var/lib/postgresql/data --restart=always postgres
And to run your pgadmin instance as a Docker container:
docker run -p 80:80 -e "PGADMIN_DEFAULT_EMAIL=user@domain.com" -e "PGADMIN_DEFAULT_PASSWORD=SuperSecret" -d dpage/pgadmin
Now when you go into the admin console you cannot connect to your local database server via localhost.
You need to run docker inspect postgres-server to get the IP address of the container and connect with that IP address in your admin console.
Now if you want to connect with Diesel (Rust) then you need to use as server address 0.0.0.0 If you want to connect via .NET with npgsql package you need to use a connectionstring like the following:
var connectionString = "Server=localhost;Username=postgres;Password=mysecretpassword;Database=enterpreneurs";