add systemd unit file

exampleconfig.toml

@@ -3,7 +3,7 @@ homeserver_url = "https://matrix.org"
 user_id = "@ruffbot:matrix.org"
 password = "xxx"
 # path to store databases
-store_path = "store"
+store_path = "/var/cache/ruff"
 
 # !sendmeme <id> to make ruff send the meme with the given id
 sendmeme_command = "!sendmeme"

ruff.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Next gen uff bot
+
+[Service]
+ExecStart=/usr/bin/ruff -c /etc/ruff/config.toml
+Environment=RUST_LOG=information
+
+[Install]
+WantedBy=default.target