feat: check if game server is listed on linuxgsm.com

Author: dgibbs64

.github/workflows/details-check.yml

@@ -72,3 +72,6 @@ jobs:
 
       - name: Query Raw
         run: LGSM_GITHUBBRANCH="${GITHUB_REF#refs/heads/}" ./${{ matrix.shortname }}server query-raw
+
+      - name: Check game server is listed on LinuxGSM.com
+        run : curl -L -s -o -I --fail -w "%{http_code}" https://linuxgsm.com/servers/${{ matrix.shortname }}server