Add `autossh` about homelab HOT 2 CLOSED

# See: https://www.jeffgeerling.com/blog/2022/ssh-and-http-raspberry-pi-behind-cg-nat
- name: Configure node 1 as a reverse tunnel for SSH and HTTP.
  hosts: control_plane
  gather_facts: false
  become: true

  vars_files:
    - ../../config.yml

  tasks:
    - name: Install autossh.
      ansible.builtin.apt:
        name: autossh
        state: present

    - name: Configure autossh defaults.
      ansible.builtin.copy:
        dest: /etc/default/autossh
        content: |
          AUTOSSH_POLL=60
          AUTOSSH_FIRST_POLL=30
          AUTOSSH_GATETIME=0
          AUTOSSH_PORT=22000
          SSH_OPTIONS="-N -R 2222:localhost:22 -R 8080:localhost:80 {{ reverse_tunnel_vps_username }}@{{ reverse_tunnel_vps_hostname }}"
    - name: Create autossh unit file.
      ansible.builtin.copy:
        dest: /lib/systemd/system/autossh.service
        content: |
          [Unit]
          Description=autossh
          Wants=network-online.target
          After=network-online.target
          [Service]
          Type=simple
          User=pi
          EnvironmentFile=/etc/default/autossh
          ExecStart=/usr/bin/autossh $SSH_OPTIONS
          Restart=always
          RestartSec=60
          [Install]
          WantedBy=multi-user.target
      register: autossh_unit

    - name: Reload systemd daemon if unit file changed.
      ansible.builtin.systemd:
        daemon_reload: true
      when: autossh_unit is changed

    - name: Ensure autossh service is running.
      ansible.builtin.systemd:
        name: autossh
        state: started
        enabled: true