ci: add multi-artifact build #626

Job	Run time
Build and package cores	8m 38s
Split off zephyr_contrib	10s
Split off zephyr_main	15s
Split off zephyr_unoq	7s
Split off zephyr	15s
Test zephyr_main:nano33ble	2m 46s
Test zephyr_main:portentac33	2m 41s
Test zephyr_main:portentah7	2m 41s
Test zephyr_contrib:ek_ra8d1	2m 40s
Test zephyr:unoq	2m 39s
Test zephyr_main:giga	2m 46s
Test zephyr_contrib:frdm_rw612	2m 39s
Test zephyr_main:opta	2m 39s
Test zephyr_contrib:frdm_mcxn947	2m 40s
Test zephyr_main:niclasense	2m 39s
Publish jsons	6s
Collect logs	6s
verify-core	0s
Publish core	0s
cleanup-artifacts	3s
Build and package cores	8m 38s
Split off zephyr_contrib	10s
Split off zephyr	15s
Split off zephyr_unoq	7s
Split off zephyr_main	15s
Test zephyr_main:giga	2m 46s
Test zephyr_main:niclasense	2m 39s
Test zephyr_main:portentac33	2m 41s
Test zephyr:unoq	2m 39s
Test zephyr_main:nano33ble	2m 46s
Test zephyr_main:opta	2m 39s
Test zephyr_main:portentah7	2m 41s
Test zephyr_contrib:ek_ra8d1	2m 40s
Collect logs	6s
Publish jsons	5s
Publish core	-1640s
Test zephyr_contrib:frdm_mcxn947	2m 40s
verify-core	-1640s
Test zephyr_contrib:frdm_rw612	2m 39s
cleanup-artifacts	3s
	18m 19s

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