ci: add multi-artifact build #629

Job	Run time
Build and package cores	8m 13s
Split off zephyr	9s
Split off zephyr_unoq	12s
Split off zephyr_main	12s
Split off zephyr_contrib	14s
Test zephyr_main:opta	2m 49s
Test zephyr_contrib:ek_ra8d1	2m 42s
Test zephyr_main:niclasense	3m 2s
Test zephyr_main:giga	2m 51s
Test zephyr_contrib:frdm_rw612	2m 38s
Test zephyr_main:portentah7	2m 45s
Test zephyr:unoq	2m 31s
Test zephyr_main:portentac33	2m 48s
Test zephyr_main:nano33ble	2m 43s
Test zephyr_contrib:frdm_mcxn947	2m 46s
Collect logs	6s
Publish jsons	15s
verify-core	0s
Publish core	-1s
cleanup-artifacts	3s
	36m 58s

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