ci: add multi-artifact build #625

Job	Run time
Build and package cores	8m 29s
Split off zephyr_contrib	26s
Split off zephyr	9s
Split off zephyr_unoq	6s
Split off zephyr_main	15s
Test zephyr_main:giga	2m 49s
Test zephyr_main:nano33ble	2m 47s
Test zephyr_main:niclasense	2m 42s
Test zephyr_contrib:frdm_mcxn947	2m 45s
Test zephyr_main:portentah7	2m 54s
Test zephyr_main:opta	2m 49s
Test zephyr_contrib:ek_ra8d1	2m 36s
Test zephyr_main:portentac33	2m 15s
Test zephyr:unoq	2m 35s
Test zephyr_contrib:frdm_rw612	2m 36s
Collect logs	9s
Publish core	0s
cleanup-artifacts	3s
Publish jsons	0s
verify-core	0s
	36m 25s

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