Add gnosis variant checkpoint sync URL and fix TCP port

Agent-Logs-Url: https://github.com/dappnode/DAppNodePackage-lighthouse-generic/sessions/ea553da6-681b-4372-af09-8b3152c77726

Co-authored-by: Marketen <36164126+Marketen@users.noreply.github.com>

Author: Copilot

package_variants/gnosis/docker-compose.yml

@@ -7,10 +7,11 @@ services:
         NETWORK: gnosis 
         P2P_PORT: 19004
     ports:
-      - "19004:19004/tcp"
+      - "19004:19004"
       - "19004:19004/udp"
     environment:
       CORSDOMAIN: "http://lighthouse-gnosis.dappnode"
+      CHECKPOINT_SYNC_URL: "https://checkpoint-sync-gnosis.dappnode.net"
   validator:
     build:
       args: