fix the entrypoint to not crash the node

fantom/scripts/entrypoint-fullnode.sh

@@ -25,7 +25,7 @@ else
     echo "Node key already exists, skipping generation."
 fi
 
-opera \
+exec opera \
     --genesis=$FANTOM_HOME/mainnet-171200-no-history.g \
     --port=19921 \
     --maxpeers=200 \

fantom/scripts/entrypoint.sh

@@ -22,7 +22,7 @@ fi
 # uncomment the next line and do docker-compose build in case you have to try to fix the db after unclean shutdown etc.
 # opera --db.preset pbl-1 --datadir=$FANTOM_HOME db heal --experimental
 
-opera \
+exec opera \
     --genesis=$FANTOM_HOME/mainnet-5577-full-mpt.g \
     --port=5050 \
     --maxpeers=200 \