Change default log verbosity via environment variable

[gitfool]

I'm perusing the Cake code looking for a way to change the default log verbosity in an ambient way - via an environment variable. I know there are ways to do this with shell aliases but I was curious if I could push this into Cake so that naked dotnet cake uses it.

Currently the log verbosity is set very early on via the command-line options:

• Program.Run
• DefaultCommand.Execute
• DefaultCommandSettings.Verbosity

I don't see a clean way to do this. Does anyone have any ideas?

(I did have one possibly crazy idea: support a convention for environment variable names as options, overridden by command-line options, similar to the way .NET Core with multiple configuration sources work; this could even be pushed to Spectre.Console/Cli, which now handles the Cake CLI.)