Specify override for every TS dotenv call.

[DanielRosenwasser]

Fixes issues if (for some reason) environment variables are already specified.

[DanielRosenwasser]

@jakebailey mentions this may not be desirable since users should be able to declare an environment variable before running the program. On the other hand, I wonder how many people do that with a different key?

[jakebailey]

My shell is configured (I think a default in zsh, or maybe just oh-my-zsh?) to not store any command that starts with a space into history, so I can run command with secrets in my terminal without putting them anywhere and that's pretty useful.

PowerShell can do it to with this in profile.ps1:

Set-PSReadLineOption -AddToHistoryHandler {
    param($command)
    if ($command -like ' *') {
        return $false
    }
    return $true
} 

Of course, these are just examples. Not really sure how we are expecting them to be run.

[DanielRosenwasser]

Looks like I needed this because of microsoft/vscode-python#23078