Generate a persistent key for an Ethermint bootstrap node

[jbowen93]

For testing P2P communication between multiple Ethermint nodes we need to have a bootstrap peer. For this to work well in the ephemeral cluster we should manually generate a pub/priv key pair and store it in version control. We should use this key when starting the first Ethermint node and note its PeerID.

[jbowen93]

Currently stuck with the config in #18 and the docker changes in celestiaorg/ethermint#45.

The 2nd node (ethermint1) just waits at

11:06AM INF starting P2P client
11:06AM INF serving HTTP listen address={"IP":"::","Port":26657,"Zone":""}
11:06AM INF listening on address=/ip4/192.167.4.1/tcp/26656/p2p/12D3KooWDUrh88NUhtMxnLzFY7i4CPbL18MRkAuJFkXwSkJ8Dk5w module=p2p
11:06AM INF listening on address=/ip4/127.0.0.1/tcp/26656/p2p/12D3KooWDUrh88NUhtMxnLzFY7i4CPbL18MRkAuJFkXwSkJ8Dk5w module=p2p
11:06AM INF no seed nodes - only listening for connections module=p2p
11:06AM INF starting GRPC DALC host=192.167.3.0 module=da_client port=7980
11:06AM INF ABCIQuery data= module=events path=/ethermint.evm.v1.Query/Params result={"code":111222,"codespace":"undefined","height":"0","index":"0","info":"","key":null,"log":"panic message redacted to hide potentially sensitive system info: panic","proofOps":null,"value":null}
11:06AM INF Starting JSON-RPC server address=0.0.0.0:8545
11:06AM INF Starting JSON WebSocket server address=0.0.0.0:8546

I'm not sure if the error

11:06AM INF ABCIQuery data= module=events path=/ethermint.evm.v1.Query/Params result={"code":111222,"codespace":"undefined","height":"0","index":"0","info":"","key":null,"log":"panic message redacted to hide potentially sensitive system info: panic","proofOps":null,"value":null}

is important but it doesn't appear on the ethermint0 node.