Add Portenta H7 boards to matrix jobs in Compile Examples CI workflow

[per1234]

The library examples will be compiled for Portenta H7 (M7 core) and Portenta H7 (M4 core) boards, using the Arduino mbed OS-enabled boards platform from the tip of its repository's default branch.

Fixes #38

[github-actions]

Memory usage change @ 93ef165

Board	flash	RAM for global variables
arduino-beta:mbed:envie_m4	0 - 0	0 - 0
arduino-beta:mbed:envie_m7	0 - 0	0 - 0
arduino:samd:mkr1000	0 - 0	0 - 0
arduino:samd:mkrgsm1400	0 - 0	0 - 0
arduino:samd:mkrwan1310	0 - 0	0 - 0
arduino:samd:mkrwifi1010	0 - 0	0 - 0
arduino:samd:nano_33_iot	0 - 0	0 - 0
esp8266:esp8266:huzzah	0 - 0	0 - 0

Click for full report table

Board	examples/ConnectionHandlerDemo flash	examples/ConnectionHandlerDemo RAM for global variables
arduino-beta:mbed:envie_m4	0	0
arduino-beta:mbed:envie_m7	0	0
arduino:samd:mkr1000	0	0
arduino:samd:mkrgsm1400	0	0
arduino:samd:mkrwan1310	0	0
arduino:samd:mkrwifi1010	0	0
arduino:samd:nano_33_iot	0	0
esp8266:esp8266:huzzah	0	0

Click for full report CSV

Board,examples/ConnectionHandlerDemo<br>flash,examples/ConnectionHandlerDemo<br>RAM for global variables
arduino-beta:mbed:envie_m4,0,0
arduino-beta:mbed:envie_m7,0,0
arduino:samd:mkr1000,0,0
arduino:samd:mkrgsm1400,0,0
arduino:samd:mkrwan1310,0,0
arduino:samd:mkrwifi1010,0,0
arduino:samd:nano_33_iot,0,0
esp8266:esp8266:huzzah,0,0

[aentinger]

Thank you @per1234 👋 🚀