fix amount setting

[Jason-W123]

We force user to use AMOUNT as env var, but it doesn't use it when deposit ethers, so this pr also let the script use AMOUNT for ethers deposit.

[gzeoneth]

It is quite unclear what env are needed to be configured, can we move to use dotenv and provide a .env.example? Also the amount feels more like an arg than sth that should be configured in env tbh

[Jason-W123]

It is quite unclear what env are needed to be configured, can we move to use dotenv and provide a .env.example? Also the amount feels more like an arg than sth that should be configured in env tbh

I remember we used to use dotenv before, but it changed to this now, do you have any ideas on this @GreatSoshiant ?

[robin-rrt]

Any update on merging this yet?