Before starting ethereum-sender, you must first configure the following environment variables.
You can also modify them in file docker-compose.yaml if you start it by docker-compose.
database to store launch logs. e.g. postgres://postgres:postgres@localhost:5432/postgres?sslmode=disable
a ethereum node to send transaction and query transaction receipt. e.g. http://localhost:8545
to sign the transactions. e.g. 0xb7a0c9d2786fc4dd080ea5d619d36771aeb0c8c26c290afd3451b92ba2b7bc2c