Restart radicale if needed

src/freedombone-app-radicale

     echo 'User=www-data' >> /etc/systemd/system/radicale.service
     echo 'Group=www-data' >> /etc/systemd/system/radicale.service
     echo "ExecStart=/usr/local/bin/radicale --config ${RADICALE_DIRECTORY}/config" >> /etc/systemd/system/radicale.service
+    echo 'Restart=on-failure' >> /etc/systemd/system/radicale.service
+    echo 'RestartSec=10' >> /etc/systemd/system/radicale.service
     echo '' >> /etc/systemd/system/radicale.service
     echo '[Install]' >> /etc/systemd/system/radicale.service
     echo 'WantedBy=multi-user.target' >> /etc/systemd/system/radicale.service