Add systemd support

[morbidick]

i added the option to use systemd instead of supervisord. To handle both handlers with the listen directive i had to set ansible min version to >=2.2, i took the opportunity to migrate the sudo statements to become and fix the warnings.

[astorije]

Hey @morbidick, sorry I never replied to you!

We actually have DEBs for The Lounge, built using https://github.com/thelounge/deb-lounge and stored with every (non pre-release) versions, for example here: https://github.com/thelounge/lounge/releases/tag/v2.6.0 (see the bottom: lounge.deb).

Would you be willing to switch your change to use that instead?

There will be a couple issues for sure (like not being able to use pre-releases at the moment), but I do think on the long run this repo should not install Supervisor / the npm package anymore. Your PR would be a good start :)

[astorije]

Also, note that a few changes on The Lounge make this transition easier: it can now start without users, we can use .lounge_home (soon to be thelounge_home) to set up the config location, etc.

[morbidick]

thx, for the feedback, i wrote this when i had to redeploy my personal server. I'll probably do a rewrite the next time (maybe even this year ;) ).

[Duckle29]

If you are going to rewrite it, and still only want to support debian based distros, then this is what I currently use in my vps-deployment playbook:

- name: Install thelounge
  hosts: vps
  become: true
  tags:
    - thelounge
  
  tasks:
    - name: Install nodejs
      include_role:
        name: geerlingguy.nodejs
      vars:
        nodejs_version: "11.x"
        nodejs_install_npm_user: root

    - name: Get the latest release info
      uri:
        url: https://api.github.com/repos/thelounge/thelounge/releases/latest
        return_content: true
      register: lounge_json_response
      failed_when: lounge_json_response.json.assets.0.content_type != "application/x-debian-package"

    - name: Get the latest thelounge .deb
      get_url: 
        url: '{{ lounge_json_response.json.assets.0.browser_download_url }}'
        dest: /root/
      register: lounge_deb_file
    
    - name: Install thelounge
      apt:
        deb: '{{ lounge_deb_file.dest }}'

    - name: Remove .deb file
      file:
        state: absent
        path: '{{ lounge_deb_file.dest }}'

    - name: Stop thelounge before changing config
      service:
        name: thelounge
        state: stopped

    - name: Set up config
      template:
        src: templates/thelounge-config.js.j2
        dest: /etc/thelounge/config.js

    - name: Start and enable thelounge
      service:
        enabled: yes
        name: thelounge
        state: started

This is quick and dirty. It works, but it doesn't do any user configuration, it doesn't really have any customization, it's not idempotent if a new release comes out, it only works on Debian based distros

Once I've got my VPS moved/deployed, I might play around with making this into a separate role. However as with all "TODOs" that might end up at the bottom of the piles, so feel free to use what you can :)

I'd also really want to support multiple distros, which I think I'll do through yarn.