feat: add puppetboard role

- add nginx module to manage reverse proxy on host level
- add puppetboard venv
- add gunicorn instance
- add script to start the gunicorn instance
- add nginx vhost

site/profiles/templates/puppet/puppetboard/puppetboard.service.erb

@@ -0,0 +1,12 @@
+[Unit]
+Description=puppetboard daemon
+After=network.target
+[Service]
+Type=simple
+User=<%= @user %>
+Group=<%= @group %>
+Environment="PUPPETBOARD_SETTINGS=<%= @settings_file %>"
+ExecStart=<%= @virtualenv_dir %>/bin/start_puppetboard
+PrivateTmp=true
+[Install]
+WantedBy=multi-user.target