Use correct build output dir for generic PICO

.github/workflows/micropython.yml

@@ -10,6 +10,7 @@ env:
   # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
   MICROPYTHON_VERSION: v1.15
   BUILD_TYPE: Release
+  BOARD_TYPE: PICO
 
 jobs:
   build:
@@ -72,7 +73,7 @@ jobs:
       env:
         GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
       with:
-        asset_path: micropython/ports/rp2/build/firmware.uf2
+        asset_path: micropython/ports/rp2/build-${{env.BOARD_TYPE}}/firmware.uf2
         upload_url: ${{github.event.release.upload_url}}
         asset_name: ${{github.event.repository.name}}-${{github.event.release.tag_name}}-micropython-${{env.MICROPYTHON_VERSION}}.uf2
         asset_content_type: application/octet-stream