Installing STM32WL package for github actions

[maxgerhardt]

@strooom

.platformio/platforms/ststm32/platform.json

Mh that should in the home path, i.e. ~/.platformio/platforms/ststm32/platform.json

@strooom

      - name: Install STM32CubeWL
        uses: actions/checkout@v4
        with:
          repository: STMicroelectronics/STM32CubeWL
          path: .platformio/packages/framework-stm32cubewl
          submodules: true

That’s not sufficient because it’s missing the package.json (e.g. from here) for that package, otherwise PlatformIO won’t find it.