Package, test and upload core

Update README.md: pre-requirements for macOS and fix flash loader instructions #311

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Run time

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Job	Run time
Build and package core	7m 53s
Test portentah7 board	2m 53s
Test frdm_rw612 board	2m 44s
Test ek_ra8d1 board	2m 43s
Test portentac33 board	2m 47s
Test frdm_mcxn947 board	2m 44s
Test nano33ble board	2m 42s
Test giga board	2m 50s
Test niclasense board	2m 40s
Test opta board	2m 54s
Collect logs	10s
Publish json	0s
Publish core	0s
	33m 0s