CI: Move modules_py copy to CMake

.github/workflows/micropython.yml

@@ -97,11 +97,6 @@ jobs:
         submodules: true
         path: pimoroni-pico-${{ github.sha }}
 
-    # Copy Python module files
-    - name: Copy modules
-      run: |
-        cp -r pimoroni-pico-${GITHUB_SHA}/micropython/modules_py/* micropython/ports/rp2/modules/
-
     - name: Configure MicroPython
       shell: bash
       working-directory: micropython/ports/rp2

micropython/modules/micropython.cmake

@@ -1,6 +1,7 @@
 include_directories(${CMAKE_CURRENT_LIST_DIR}/../../)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}")
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/../")
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/../../")
 
 include(pimoroni_i2c/micropython)
@@ -41,3 +42,5 @@ include(pico_wireless/micropython)
 include(plasma/micropython)
 include(hub75/micropython)
 include(ulab/code/micropython)
+
+include(modules_py/modules_py)

micropython/modules_py/modules_py.cmake

@@ -0,0 +1,20 @@
+function (copy_module TARGET SRC DST)
+    add_custom_command(
+        OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/../modules/${DST}.py
+
+        COMMAND
+            cp ${SRC} ${CMAKE_CURRENT_BINARY_DIR}/../modules/${DST}.py
+
+        DEPENDS ${src}
+    )
+
+    target_sources(${TARGET} INTERFACE ${CMAKE_CURRENT_BINARY_DIR}/../modules/${DST}.py)
+endfunction()
+
+# Create a dummy usermod to hang our .py copies from
+add_library(usermod_modules_py INTERFACE)
+target_link_libraries(usermod INTERFACE usermod_modules_py)
+
+# .py files to copy from modules_py to ports/rp2/modules
+copy_module(usermod_modules_py ${CMAKE_CURRENT_LIST_DIR}/picosystem.py picosystem)
+copy_module(usermod_modules_py ${CMAKE_CURRENT_LIST_DIR}/pimoroni.py pimoroni)