CICD: failure to upload is reflected in pipeline status.

pio test always returns 0 if run with --without-building and --without-uploading. This prevents the pipeline from catching upload failures. On the contrary, pio run -t upload returns a meaningful status code; however it must be run necessarily with -t nobuild, otherwise Platformio rebuilds the whole project. Moreover, for pio run -t upload -t nobuild to correctly "accept" the firmware built in the previous stage, we have to pass the checksum of the project together with the firmware files.

[skip hw container] [skip examples]