as long as ch552 is not a ci-arduino recognized board, it has to be a
"none.test.only" file. Rename these once the related issue is closed
in ci-arduino.
These named platforms (ch552, trrstrinkey_m0, shttrinkey_m0,
pixeltrinkey_m0) may not be correct and they need to be listed in
ci-arduino all_platforms.py and arduino_cron.yml to work. The main goal
is to get OTHER microcontroller builds to skip these examples.
