Service container - Use localhost along with container job?

[retzero]

Do you have any idea how to use localhost (rather than it's service name) along with container job?

This doc says...

You can access service containers from the Docker host using localhost and the Docker host port number.

Example workflow;

jobs:
  build:
    container:
      image: python:3.8.10
    runs-on: ubuntu-latest
    services:
      postgres:
        image: postgres:11.12
        options: --network-alias localhost
        env:
          POSTGRES_USER: testuser
          POSTGRES_HOST_AUTH_METHOD: trust
    steps:
      - name: Connecting POSTGRES (postgres)
        run: until nc -z postgres 5432; do echo "connecting postgres..."; sleep 1; done
      - name: Connecting POSTGRES (localhost)
        run: until nc -z localhost 5432; do echo "connecting postgres..."; sleep 1; done # Stuck here....

[mikejoseph-ef]

would like to know this as well

edit: got it to work with install socat (apt-get install -y socat), and using the command
socat TCP-LISTEN:5432,fork TCP:postgres:5432 &