variants: Enable file system support. #666

Job	Run time
Build and package cores	9m 35s
Split off zephyr_unoq	7s
Split off zephyr	9s
Split off zephyr_main	8s
Split off zephyr_contrib	13s
Test zephyr_main:nano33ble	2m 36s
Test zephyr_main:giga	2m 38s
Test zephyr_main:portentah7	2m 35s
Test zephyr:unoq	5m 41s
Test zephyr_main:opta	1m 55s
Test zephyr_main:niclasense	2m 23s
Test zephyr_main:portentac33	2m 28s
Test zephyr_contrib:frdm_rw612	2m 27s
Test zephyr_contrib:frdm_mcxn947	2m 21s
Test zephyr_contrib:ek_ra8d1	2m 32s
Collect logs	6s
Publish jsons	24s
Publish core	0s
verify-core	0s
cleanup-artifacts	4s
	38m 22s

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