Package, test and upload core

Update README.md: pre-requirements for macOS and fix flash loader instructions #308

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Run time

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Job	Run time
Build and package core	7m 9s
Test giga board	2m 43s
Test nano33ble board	2m 40s
Test niclasense board	2m 42s
Test frdm_mcxn947 board	2m 44s
Test portentah7 board	2m 43s
Test opta board	2m 42s
Test ek_ra8d1 board	2m 41s
Test frdm_rw612 board	2m 50s
Test portentac33 board	2m 42s
Collect logs	5s
Publish json	0s
Publish core	-1s
	31m 40s