Ensure sdist only contains the code itself

Without doing this the uv build command tries to include too many things
and it fails

Author: delfick

pyproject.toml

@@ -41,6 +41,11 @@ allow-direct-references = true
 [tool.hatch.version]
 path = "django_consistency_enforcer/version.py"
 
+[tool.hatch.build.targets.sdist]
+include = [
+    "/django_consistency_enforcer",
+]
+
 [tool.hatch.build.targets.wheel]
 include = [
     "/django_consistency_enforcer",