config: enable loading config from env variables #68
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Fixes: https://github.com/starfishlabs/oasis-evm-web3-gateway/issues/1
Configuration management switched from
viper
tokoanf
, due to some sad viper bugs:All config variables can now be overriden via env flags. Note: env hierarchy delimiter used is
__
, example, to setdatabse.host
: use theDATABASE__HOST
env variable.