What problem does this feature solve?

I have multiple VUE applications in a workspace and don't want to maintain multiple .env files for each instance. It would be great if I could take advantage of the DOTENV environment configuration option to specify where to find the .env file when loading the configuration. See https://www.npmjs.com/package/dotenv#preload

What does the proposed API look like?

Not sure how the inner workings are pulling in the .env variables. I would just like it to work the same way that DOTENV works today. If there is a DOTENV_CONFIG_PATH environment variable set, use its value as the path for the .env file.