[#81202720] chore (config) clean up environment var in koast config

- Remove local environment variable in config.js
- Use process.env.NODE_ENV
Merge pull request #62 from e-schultz/chore-cleanup-env-config

[Finishes #81202720] chore (config) clean up environment var in koast config
[Fixes #81221168] Refactor makeKey(file) to makeKey(req, file)
Merge pull request #63 from rafkhan/s3-makeKey-with-req

Refactor makeKey(file) to makeKey(req, file)