Omegaconf: Unobtrusive way to mix env vars over plan data yaml config

omegaconf_mixin_unobtrusive.py

import os
from omegaconf import OmegaConf

os.environ.pop("PASSWORD", None)
os.environ.pop("PORT", None)

os.environ["PASSWORD"] = "foo"
os.environ["PORT"] = '666'

file_cfg = OmegaConf.create("inference_worker: {user: Ohad, password: secret, port: 123}")
env_cfg = OmegaConf.create("inference_worker: {port: '${oc.decode:${oc.env:PORT, null}}'}")
# populate from env (resolve)
OmegaConf.resolve(env_cfg)

# mixin cfg=file<-env<-cli
cfg = OmegaConf.merge(file_cfg, env_cfg, OmegaConf.from_cli())
print(OmegaConf.to_yaml(cfg.inference_worker))