Avoid repeating list of packages for all systems

[lily-gh]

Problem

Right now, we duplicate the list of installed packages for multiple systems. E.g. both arch-packages.yml, ubuntu-packages.yml and macos-packages.yml define lists with similar packages:

# macos-packages.yml
- name: Install packages on macOS
  ansible.builtin.homebrew:
    name: "{{ item }}"
  with_items:
    - bat
    - ffmpeg
    - fzf
    - git
    - gpg
    - eza
    - vim
    - zsh
    - zsh-syntax-highlighting
    - zsh-autosuggestions
    - ansible
    - asdf

# ubuntu-packages.yml
- name: Install packages
  ansible.builtin.apt:
    name: "{{ item }}"
    state: latest
  with_items:
    - curl
    - unzip
    - bat
    - ffmpeg
    - fzf
    - gcc
    - gpg
    - git
    - eza
    - vim
    - zsh
    - xclip
    - wget
  become: true

# arch-packages.yml
- name: Install packages
  community.general.pacman:
    name: "{{ item }}"
    state: latest
  with_items:
    - curl
    - unzip
    - bat
    - ffmpeg
    - fzf
    - gcc
    - git
    - pcre2
    - eza
    - vim
    - zsh
    - xclip
    - wget
  become: true

Desired state

Ideally we should have a common variable that defines a list with the packages that repeat for every system.