codeownership validate --diff not respecting owned_globs

[kendix]

I recently noticed that my calls to codeownership validate --diff had started to fail for files that were not specifically included in the owned_globs part of our code_ownership.config file.

I first verified that when running just codeownership validate without --diff that the validation was still succeeding (which it was).

Then I verified that adding the extension of the file I was expecting to not fail validation to my owned_globs did cause it to fail.

Additionally, I verified that specifically excluding the file path in unowned_globs did not allow the --diff command to succeed.

Then I decided to figure out the last version that the --diff command was running successfully for my setup.

I determined that the change occurred in the 2.0.0.5 release and has been an issue since.

The specific error that occurs in the validate command is:

% bin/codeownership validate --diff
.local/share/mise/installs/ruby/3.4.6/lib/ruby/gems/3.4.0/gems/code_ownership-2.0.0.pre.5-arm64-darwin/lib/code_ownership.rb:236:in 'RustCodeOwners.generate_and_validate': Unowned files detected: (RuntimeError)

I suspect that for some reason the --diff command is somehow ignoring the config file.