chore: switch to new ISO builder action #90

Job	Run time
Build (amd64, 39, base)	3m 0s
Build (amd64, 39, silverblue)	3m 19s
Build (amd64, 39, kinoite)	3m 20s
Build (amd64, 40, base)	2m 25s
Build (amd64, 40, silverblue)	2m 38s
Build (amd64, 40, kinoite)	2m 37s
Build (amd64, rawhide, base)	2m 14s
Build (amd64, rawhide, silverblue)	2m 6s
Build (amd64, rawhide, kinoite)	2m 40s
Build (arm64, 39, base)	2m 21s
Build (arm64, 39, silverblue)	2m 58s
Build (arm64, 39, kinoite)	3m 40s
Build (arm64, 40, base)	2m 18s
Build (arm64, 40, silverblue)	2m 32s
Build (arm64, 40, kinoite)	2m 50s
Build (arm64, rawhide, base)	2m 18s
Build (arm64, rawhide, silverblue)	2m 29s
Build (arm64, rawhide, kinoite)	2m 28s
Check all builds successful	1s
	48m 14s

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