Improve overall configuration and support

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

support/systemd/mobilizon.service

@@ -0,0 +1,27 @@
+[Unit]
+Description=Mobilizon Service
+After=network.target postgresql.service
+
+[Service]
+User=mobilizon
+WorkingDirectory=/home/mobilizon/mobilizon
+ExecStart=/usr/local/bin/mix phx.server
+ExecReload=/bin/kill $MAINPID
+KillMode=process
+Restart=on-failure
+EnvironmentFile=/var/www/mobilizon/.env
+
+; Some security directives.
+; Use private /tmp and /var/tmp folders inside a new file system namespace, which are discarded after the process stops.
+PrivateTmp=true
+; Mount /usr, /boot, and /etc as read-only for processes invoked by this service.
+ProtectSystem=full
+; Sets up a new /dev mount for the process and only adds API pseudo devices like /dev/null, /dev/zero or /dev/random but not physical devices. Disabled by default because it may not work on devices like the Raspberry Pi.
+PrivateDevices=false
+; Ensures that the service process and all its children can never gain new privileges through execve().
+NoNewPrivileges=true
+
+
+[Install]
+WantedBy=multi-user.target
+Alias=mobilizon.service