Extract mainnet-eth head tracking data

[dboreham]

Size of synced up data:

$ sudo du -h deployment-001/
12K     deployment-001/config/mainnet-eth/scripts
16K     deployment-001/config/mainnet-eth
8.0K    deployment-001/config/foundry
28K     deployment-001/config
146M    deployment-001/data/mainnet_eth_lighthouse_1_data/beacon/freezer_db
24G     deployment-001/data/mainnet_eth_lighthouse_1_data/beacon/chain_db
16K     deployment-001/data/mainnet_eth_lighthouse_1_data/beacon/network
341M    deployment-001/data/mainnet_eth_lighthouse_1_data/beacon/logs
24G     deployment-001/data/mainnet_eth_lighthouse_1_data/beacon
24G     deployment-001/data/mainnet_eth_lighthouse_1_data
8.0K    deployment-001/data/mainnet_eth_config_data
4.0K    deployment-001/data/mainnet_eth_geth_1_data/keystore
527G    deployment-001/data/mainnet_eth_geth_1_data/geth/chaindata/ancient/chain
527G    deployment-001/data/mainnet_eth_geth_1_data/geth/chaindata/ancient
858G    deployment-001/data/mainnet_eth_geth_1_data/geth/chaindata
1.7M    deployment-001/data/mainnet_eth_geth_1_data/geth/nodes
242M    deployment-001/data/mainnet_eth_geth_1_data/geth/ethash
669M    deployment-001/data/mainnet_eth_geth_1_data/geth/triecache
859G    deployment-001/data/mainnet_eth_geth_1_data/geth
859G    deployment-001/data/mainnet_eth_geth_1_data
883G    deployment-001/data
4.0K    deployment-001/compose/foundry/workspace
8.0K    deployment-001/compose/foundry
20K     deployment-001/compose
883G    deployment-001/