include hatch build in package (#5278)

pyproject.toml

@@ -63,7 +63,7 @@ requires = ["hatchling"]
 build-backend = "hatchling.build"
 
 [tool.hatch.build]
-include = ["reflex"]
+include = ["reflex", "scripts/hatch_build.py"]
 
 [tool.hatch.build.targets.sdist]
 artifacts = ["*.pyi"]