yum-proxy: automatically restart the service on failure

vm-systemd/qubes-yum-proxy.service

@@ -8,6 +8,8 @@ ExecStartPre=/usr/bin/install -d --owner tinyproxy --group tinyproxy /var/run/ti
 ExecStartPre=/usr/lib/qubes/iptables-yum-proxy start
 ExecStart=/usr/sbin/tinyproxy -d -c /etc/tinyproxy/tinyproxy-qubes-yum.conf
 ExecStopPost=/usr/lib/qubes/iptables-yum-proxy stop
+Restart=on-failure
+RestartSec=5s
 
 [Install]
 WantedBy=multi-user.target