feature: enable arm64 image builds #1911

Job	Run time
build-base (40, silverblue, x64)	6m 47s
build-base (40, silverblue, arm64)	7m 54s
build-base (40, kinoite, x64)	8m 58s
build-base (40, kinoite, arm64)	9m 52s
build-base (40, cosmic, x64)	1m 5s
build-base (40, cosmic, arm64)	11s
build-base (stable, silverblue, x64)	9m 18s
build-base (stable, silverblue, arm64)	9m 30s
build-base (stable, kinoite, x64)	10m 5s
build-base (stable, kinoite, arm64)	12m 5s
build-base (stable, cosmic, x64)	1m 27s
build-base (stable, cosmic, arm64)	20s
build-nvidia (40, silverblue, open, x64)	1m 1s
build-nvidia (40, kinoite, open, x64)	52s
manifest	0s
build-nvidia (40, cosmic, open, x64)	3m 31s
build-nvidia (stable, silverblue, open, x64)	59s
build-nvidia (stable, kinoite, open, x64)	3m 56s
build-nvidia (stable, cosmic, open, x64)	1m 13s
check	9s
manifest-nvidia	0s
	1h 29m 13s

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