computer-playbook/roles/docker-postgres/tasks/main.yml

- name: Create Docker network for PostgreSQL
  docker_network:
    name: postgres_network
    state: present
  when: run_once_docker_postgres is not defined

- name: Install PostgreSQL
  docker_container:
    name: postgres
    image: postgres:latest
    detach: yes
    env:
      POSTGRES_PASSWORD: "{{ central_postgres_password }}"
    networks:
      - name: postgres_network
    published_ports:
      - "127.0.0.1:5432:5432"
  when: run_once_docker_postgres is not defined

- name: Run the docker_postgres tasks once
  set_fact:
    run_once_docker_postgres: true
  when: run_once_docker_postgres is not defined