apply go guidelines + fix #66662

traefik.service

@@ -3,7 +3,6 @@ Description=Traefik
 Documentation=https://docs.traefik.io
 After=network-online.target
 AssertFileIsExecutable=/usr/bin/traefik
-AssertPathExists=/etc/traefik/traefik.toml
 
 [Service]
 # Run traefik as its own user (create new user with: useradd -r -s /bin/false -U -M traefik)
@@ -12,7 +11,7 @@ AmbientCapabilities=CAP_NET_BIND_SERVICE
 
 # configure service behavior
 Type=notify
-ExecStart=/usr/bin/traefik --configFile=/etc/traefik/traefik.toml
+ExecStart=/usr/bin/traefik
 Restart=always
 WatchdogSec=1s