Ansible - Install PostgreSQL on Ubuntu

vi install_postgresql.yml

---
- hosts: all
  become: yes
  tasks:
    - name: Install required packages
      apt:
        name: "{{ item }}"
        update_cache: yes
      loop:
        - wget
        - ca-certificates

    - name: PostgreSQL Key
      shell: wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -

    - name: PostgreSQL Repo Source List
      shell: sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main" >> /etc/apt/sources.list.d/pgdg.list'

    - name: Install PostgreSQL
      apt:
        name: "{{ item }}"
        update_cache: yes
      loop:
        - postgresql
        - postgresql-contrib