Adds --parent-chain.blob-client.secondary-beacon-url=${ETHEREUM_<L1>_BEACON_REST_FALLBACK}
to all nitro clients using ethereum L1 (non-arbitrum l1_network_name).
Chains with l1_network_name=arbitrum (apechain, opencampuscodex) remain unchanged
as the flag is inside the non-arbitrum guard.
Generated from templates/clients/nitro.yml + default.env changes in PR #4332.
Orbit rollup on Ethereum/Sepolia with per-chain baseConfig assets (testnet
info-json from official config; mainnet genesis-json-file bootstrap).
Co-authored-by: Cursor <cursoragent@cursor.com>