Add support for the `envFile` command for loading environment variables from a file [as described in vscode's debugging docs](https://code.visualstudio.com/docs/editor/debugging) As a temporary measure I'm using [the command variable extension](https://stackoverflow.com/questions/63033968/how-do-i-use-custom-environment-variables-in-launch-json-in-vscode)
Add support for the
envFilecommand for loading environment variables from a file as described in vscode's debugging docsAs a temporary measure I'm using the command variable extension