Support Custom Network?

Configuration Custom Network :

```
REACT_APP_IS_MAINNET=false
REACT_APP_RPC_ENABLED=true
REACT_APP_RPC_URL=https://rpc-phase1.cartenz.works/
REACT_APP_CONTRACT_ADDRESS=0x4242424242424242424242424242424242424242
REACT_APP_ETH_REQUIREMENT=2048
REACT_APP_ETH_DEPOSIT_OFFSET=0
REACT_APP_PRICE_PER_VALIDATOR=32
REACT_APP_TESTNET_LAUNCHPAD_NAME=Cartenz
REACT_APP_EL_TESTNET_NAME=Cartenz
REACT_APP_TESTNET_ITERATION=1
REACT_APP_CHAIN_ID=1881
REACT_APP_GENESIS_FORK_VERSION=0x00677693
REACT_APP_TUTORIAL_URL=https://docs.gitshock.com/gitshock-testnet-overview/gitshock-chain-evm-testnet
REACT_APP_MIN_DEPOSIT_CLI_VERSION=1.0.0
REACT_APP_LIGHTHOUSE_INSTALLATION_URL=https://lighthouse-book.sigmaprime.io/
REACT_APP_NIMBUS_INSTALLATION_URL=https://nimbus.guide/intro.html
REACT_APP_PRYSM_INSTALLATION_URL=https://docs.prylabs.network/docs/install/install-with-script
REACT_APP_TEKU_INSTALLATION_URL=https://docs.teku.pegasys.tech/en/latest/HowTo/Get-Started/Build-From-Source/
REACT_APP_FORTMATIC_KEY=pk_live_97B46AB6B178EBCE
```

Staking-Deposit-Cli
im rebuild and adding the `genesis validator root` `GENESIS_FORK` and network, but after to send deposit.json on launchpad cannot accept.

Example Deposit Data:
```
[
{
"pubkey": "90df119f92292368c61d502b378be78ee9ea6f1217b4b357308969e7091c7e0d7e0da3bc77b6ddf78340a6078b4afba4",
"withdrawal_credentials": "00bb6491fe1d325a9db909ae5922e7cfc80c78c16a84a4e2a61919d9f223f758",
"amount": 32000000000,
"signature": "8090781a74f2dcb5d6787a487820113b6c198e4cc3c80a508e5fb9cc86b84735a5a4820f48e0c9644ed53f34f90ddffe119d74be3ffd99a2afb98461e9f40a2dd2ffbae79d3e4587dab2bc93305a471fcdc55fd75ddaf6aca6c4e9eed4943ce2",
"deposit_message_root": "eea28bd78f207adbcf971283735e54050214f5261d975c18575bf7648e5f6a0f",
"deposit_data_root": "e39ff4c68f38a5b5d04a65a4f31eacbd63e307d5cc6d1f6e1886166185294650",
"fork_version": "00677693",
"network_name": "cartenz",
"deposit_cli_version": "2.5.0"
}
]
```

Start by reviewing the custom network configuration values and the launchpad's handling of the supplied deposit.json, especially fork_version, network_name, and the genesis validator root. Reproduce the reported rejection with the Cartenz configuration and staking-deposit-cli output; done means a supported custom network deposit is accepted or the required configuration limits are documented.

Written by the indexing model from the issue text.