feat: enable preview of Fedora 40 main builds #1160

Job	Run time
main image (silverblue, 38, nokmods)	3m 14s
main image (silverblue, 38, kmods)	5m 59s
main image (silverblue, 39, nokmods)	2m 37s
main image (kinoite, 38, nokmods)	3m 41s
main image (kinoite, 38, kmods)	5m 49s
main image (kinoite, 39, nokmods)	3m 14s
main image (sericea, 38, nokmods)	3m 11s
main image (sericea, 38, kmods)	5m 44s
main image (sericea, 39, nokmods)	2m 52s
main image (onyx, 39, nokmods)	3m 9s
main image (base, 38, nokmods)	3m 7s
main image (base, 38, kmods)	5m 49s
main image (base, 39, nokmods)	5m 4s
main image (lxqt, 38, nokmods)	3m 52s
main image (lxqt, 38, kmods)	6m 25s
main image (lazurite, 39, nokmods)	3m 6s
main image (mate, 38, nokmods)	4m 31s
main image (mate, 38, kmods)	7m 14s
main image (mate, 39, nokmods)	4m 5s
main image (vauxite, 38, nokmods)	3m 26s
main image (vauxite, 38, kmods)	6m 0s
main image (vauxite, 39, nokmods)	3m 16s
Check all builds successful	1s
	1h 35m 26s

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