Avoid using sudo for start-tunnel

Makefile

@@ -56,7 +56,7 @@ else
 endif
 
 start-tunnel:
-	sudo minikube tunnel
+	minikube tunnel
 
 release-autograde:
 	docker buildx build --platform linux/amd64,linux/arm64 --push -t autograde/autograde-service:1.2.2 autograde-service/

docs/dev_setup.md

@@ -67,6 +67,12 @@ As minikube resides in a Docker container, the cluster's network is isolated fro
 make start-tunnel
 ```
 
+On macOS, this must be run as root:
+
+```
+sudo make start-tunnel
+```
+
 This commands runs until exited.
 
 ### Step 6: Access the services