Add --verifier.l1-confs=4 flag to op-node (#94)

Keeps the verifier 4 L1 blocks behind the L1 head before deriving L2
data, providing tolerance for shallow L1 reorgs.

Author: palango

scripts/start-op-node.sh

@@ -35,6 +35,7 @@ exec op-node \
   --metrics.addr=0.0.0.0 \
   --metrics.port=7300 \
   --syncmode=execution-layer \
+  --verifier.l1-confs=4 \
   --p2p.priv.path=/shared/op-node_p2p_priv.txt \
   --p2p.peerstore.path=/shared/opnode_peerstore_db \
   $EXTENDED_ARG $@