chore: mention Sepolia changes in Docker Compose files (#4391)

etc/docker-compose.yml

@@ -11,11 +11,14 @@ services:
       - '8545:8545' # rpc
       - '8551:8551' # engine
     volumes:
-      - rethdata:/root/.local/share/reth/mainnet/db
+      - rethdata_mainnet:/root/.local/share/reth/mainnet/db
+      - rethdata_sepolia:/root/.local/share/reth/sepolia/db
       - rethlogs:/root/rethlogs
       - ./jwttoken:/root/jwt:ro
+    # For Sepolia, replace `--chain mainnet` with `--chain sepolia`
     command: >
       node
+      --chain mainnet
       --metrics 0.0.0.0:9001
       --log.persistent
       --log.directory /root/rethlogs
@@ -62,7 +65,9 @@ services:
              /run.sh"
     
 volumes:
-  rethdata:
+  rethdata_mainnet:
+    driver: local
+  rethdata_sepolia:
     driver: local
   rethlogs:
     driver: local

etc/lighthouse.yml

@@ -2,7 +2,6 @@ version: '3.9'
 name: reth
 
 services:
-
   lighthouse:
     restart: unless-stopped
     image: sigp/lighthouse
@@ -17,8 +16,12 @@ services:
     volumes:
       - lighthousedata:/root/.lighthouse
       - ./jwttoken:/root/jwt:ro
+    # For Sepolia:
+    # - Replace `--network mainnet` with `--network sepolia`
+    # - Use different checkpoint sync URL: `--checkpoint-sync-url https://sepolia.checkpoint-sync.ethpandaops.io`
     command: >
       lighthouse bn
+      --network mainnet
       --http --http-address 0.0.0.0
       --execution-endpoint http://reth:8551
       --metrics --metrics-address 0.0.0.0