feature: support uploading ISOs to CloudFlare #2030

Job	Run time
build-base (40, silverblue)	5m 42s
build-base (40, kinoite)	5m 42s
build-base (40, cosmic)	5m 58s
build-base (41, silverblue)	6m 1s
build-base (41, kinoite)	5m 42s
build-base (41, cosmic)	5m 40s
build-base (stable, silverblue)	5m 43s
build-base (stable, kinoite)	5m 43s
build-base (stable, cosmic)	5m 42s
build-nvidia	1s
check	10s
	52m 4s

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