Fix pytest plugin relative import

Author: LucasG0

infrahub_sdk/checks.py

@@ -189,6 +189,11 @@ def get_check_class_instance(
     try:
         spec = importlib.util.spec_from_file_location(check_config.class_name, search_location)
         module = importlib.util.module_from_spec(spec)  # type: ignore[arg-type]
+
+        # Set base module for relative import. This is useful when pytest plugin runs through proposed change pipeline,
+        # as pytest is invoked outside of the imported repository.
+        module.__package__ = str(search_location.parent)
+
         spec.loader.exec_module(module)  # type: ignore[union-attr]
 
         # Get the specified class from the module