install stubs as stub package

There doesn't seem to be another way to make mypy find these.

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
         python-version: "3.11"
     - run: pip install numpy mypy
     - run: sudo apt-get install libsuitesparse-dev libbtbb-dev liblapack-dev libcfitsio-dev libmetis-dev libgsl-dev
-    - run: cmake -DPython_EXECUTABLE=$(which python) . && make && sudo make install
+    - run: cmake -DPython_EXECUTABLE=$(which python) . && make pyphotospline && sudo make install
     - run: mypy test/*.py
   linux:
     runs-on: ubuntu-latest

CMakeLists.txt

@@ -203,7 +203,7 @@ print(pl.relative_to(d))"
   INSTALL(TARGETS pyphotospline LIBRARY DESTINATION ${PYTHON_MODULE_DIR})
   IF(${Python_VERSION} VERSION_GREATER_EQUAL "3.9")
     MESSAGE("-- + typing stubs")
-    INSTALL(FILES typings/photospline.pyi DESTINATION ${PYTHON_MODULE_DIR})
+    INSTALL(FILES typings/photospline-stubs/__init__.pyi DESTINATION ${PYTHON_MODULE_DIR}/photospline-stubs)
   ENDIF()
 ELSEIF(NOT PYTHON_FOUND)
   MESSAGE("-- Python not found, skipping build of python module")