[🐛 BUG]: replacing an array config option using environment variables doesn't work.

[rustatian]

Discussed in #1307

^{Originally posted by lyt8384 September 27, 2022}
Sorry about my poor English~ I am try to using the environment variables to replace a array config options, but isn`t work, like this.

redis:
  addrs:
    - "${REDIS_HOST_1}"
    - "${REDIS_HSOT_2}"

but it got
Error 'rpc_mget: redis_driver_mget: dial tcp: address ${REDIS_HOST_1}: missing port in address'