.env-file support should have a flag to override pre-existing env-variables

[woutervh]

I would love to see a setting to read .env-file to override/not-override pre-existing env-variables

e.g:

# load environment variables from .env file
set dotenv-filename := ".env"
set dotenv-load := true
set dotenv-enforce:= true     # to enforce the values set in .env to override pre-existing env-variables

current options:

• dotenv-filename | string | - | Load a .env file with a custom name, if present.
• dotenv-load | boolean | false | Load a .env file, if present.
• dotenv-path | string | - | Load a .env file from a custom path and error if not present. Overrides dotenv-filename.
• dotenv-required | boolean | false | Error if a .env file isn’t found.

see also #2597