add ci to verify if blocks are the same across snapshots

.github/workflows/verify-holesky.yaml

@@ -0,0 +1,16 @@
+name: Verify Sepolia
+
+on:
+  schedule:
+    - cron: '*/30 * * * *'
+  workflow_dispatch:
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Run script
+        run: ./.hack/verify.sh holesky

.github/workflows/verify-sepolia.yaml

@@ -0,0 +1,16 @@
+name: Verify Sepolia
+
+on:
+  schedule:
+    - cron: '*/30 * * * *'
+  workflow_dispatch:
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Run script
+        run: ./.hack/verify.sh sepolia

.hack/verify.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+# Set the baseURL and network as configurable variables
+network=${1:-sepolia}
+baseURL=${2:-https://snapshots.ethpandaops.io}
+
+# Array to store block numbers
+block_numbers=()
+
+# List of clients
+clients=("geth" "besu" "nethermind" "reth")
+
+echo "Verifying snapshot block numbers for network: $network"
+
+# Loop through each client and fetch block numbers
+for client in "${clients[@]}"; do
+  block_number=$(printf '%d\n' $(curl -s "$baseURL/$network/$client/latest/_snapshot_eth_getBlockByNumber.json" | jq -r '.result.number'))
+  block_numbers+=("$block_number")
+  echo "Block: $block_number ($client)"
+done
+
+# Verify if all block numbers are the same
+first_block_number="${block_numbers[0]}"
+all_same=true
+
+for i in "${!clients[@]}"; do
+  if [[ "${block_numbers[$i]}" != "$first_block_number" ]]; then
+    echo "Block number mismatch detected for client: ${clients[$i]}"
+    all_same=false
+  fi
+done
+
+if [ "$all_same" = true ]; then
+  echo "✅ All block numbers are the same: https://${network}.etherscan.io/block/${first_block_number}"
+else
+  echo "❌ Some block numbers are different."
+  exit 1
+fi