chore: temporarily pause stable scheduled builds #479

Job	Run time
build-stable / Get Workflow Info	2s
build-stable / Get Stream Info	8s
build-stable / ucore (-minimal, -nvidia, -zfs)	1m 17s
build-stable / ucore (-minimal, -nvidia)	1m 27s
build-stable / ucore (-minimal, -zfs)	1m 21s
build-stable / ucore (-minimal)	1m 16s
build-stable / fedora-coreos (-nvidia, -zfs)	1m 26s
build-stable / ucore (-nvidia, -zfs)	1m 24s
build-stable / fedora-coreos (-nvidia)	1m 18s
build-stable / ucore (-nvidia)	1m 20s
build-stable / fedora-coreos (-zfs)	1m 25s
build-stable / ucore (-zfs)	1m 24s
build-stable / ucore	1m 24s
build-stable / ucore (-hci, -nvidia, -zfs)	1m 19s
build-stable / ucore (-hci, -nvidia)	1m 21s
build-stable / ucore (-hci, -zfs)	1m 27s
build-stable / ucore (-hci)	1m 19s
build-stable / Check all successful	0s
	20m 38s

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