❔ Default command in System.CommandLine

I'm using System.CommandLine for a little CLI, and I want two commands:

compile

compile

and

run

run

. What I want is for the user to be able to just do

myapp path/to/some.file

myapp path/to/some.file

which would invoke

compile

compile

by default, but also be able to do

myapp run path/to/some.file

myapp run path/to/some.file

, in a similar vein to how

dotnet path/to/some.file

dotnet path/to/some.file

is just

dotnet exec path/to/some.file

dotnet exec path/to/some.file

. How do you do this?