variants: Enable file system support. #676

Job	Run time
Build and package cores	9m 5s
Split off zephyr	8s
Split off zephyr_main	8s
Split off zephyr_unoq	7s
Split off zephyr_contrib	8s
Test zephyr_contrib:ek_ra8d1	2m 29s
Test zephyr_main:niclasense	1m 58s
Test zephyr_contrib:frdm_rw612	1m 51s
Test zephyr_main:giga	1m 59s
Test zephyr_main:portentac33	2m 27s
Test zephyr_main:opta	2m 31s
Test zephyr_main:nano33ble	2m 36s
Test zephyr_contrib:frdm_mcxn947	2m 28s
Test zephyr:unoq	2m 24s
Test zephyr_main:portentah7	1m 53s
Collect logs	8s
Publish jsons	15s
Publish core	0s
verify-core	0s
cleanup-artifacts	4s
	32m 39s

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