feat: add incus module

- add a basic incus module

modules/incus/lib/facter/incus.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'yaml'
+
+Facter.add(:incus) do
+  setcode do
+    # Check if the 'incus' executable exists
+    incus_path = Facter::Util::Resolution.which('incus')
+    next {} unless incus_path # Return an empty fact if incus isn't found
+
+    # Run the `incus info` command using the found path
+    incus_output = Facter::Core::Execution.execute("#{incus_path} info")
+    next {} if incus_output.empty? # Return an empty fact if there's no output
+
+    # Parse the output as YAML and return it
+    YAML.safe_load(incus_output)
+  end
+end