chore: Detect other NGINX and offer to kill (#25478)

In the `start-https.sh` script, detect if some other process is
listening on the ports we need, and if yes, inform of this, and offer to
kill and proceed.

app/client/start-https.sh

@@ -340,6 +340,27 @@ if [[ -f $nginx_pid ]]; then
     unset temp_nginx_conf
 fi
 
+remaining_listeners="$(
+    lsof -nP "-iTCP:$http_listen_port" -sTCP:LISTEN || true
+    lsof -nP "-iTCP:$https_listen_port" -sTCP:LISTEN || true
+)"
+if [[ -n $remaining_listeners ]]; then
+    echo $'\nThe following processes are listening on the ports we want to use:\n'"$remaining_listeners"$'\n' >&2
+    answer=
+    for attempt in 1 2 3; do
+        echo -n 'Kill and proceed? [y/n] ' >&2
+        read -rn1 answer
+        if [[ $answer == y ]]; then
+            (lsof -t "-iTCP:$http_listen_port" -sTCP:LISTEN | xargs kill) || true
+            (lsof -t "-iTCP:$https_listen_port" -sTCP:LISTEN | xargs kill) || true
+            break
+        elif [[ $answer == n || $attempt == 3 ]]; then
+            echo $'\nAborting.' >&2
+            exit 1
+        fi
+    done
+fi
+
 if [[ $run_as == nginx ]]; then
     nginx -c "$nginx_dev_conf"
     stop_cmd="nginx -c '$nginx_dev_conf' -s quit"