set classifier service to restart only on failure (#486)

Co-authored-by: gferraro <g.ferraro22@gmail.com>

Author: gferraro

tc2/thermal-recorder-py/thermal-classifier.service

@@ -5,7 +5,7 @@ After=multi-user.target
 [Service]
 Type=simple
 ExecStart=/home/pi/.venv/classifier/bin/serve_model
-Restart=always
+Restart=on-failure
 RestartSec=3s
 
 [Install]