feat: enable preview of Fedora 40 main builds #1165

Job	Run time
main image (silverblue, 38, nokmods)	3m 25s
main image (silverblue, 38, kmods)	5m 40s
main image (silverblue, 39, nokmods)	2m 49s
main image (silverblue, 40, nokmods)	2m 32s
main image (kinoite, 38, nokmods)	3m 41s
main image (kinoite, 38, kmods)	7m 44s
main image (kinoite, 39, nokmods)	2m 55s
main image (kinoite, 40, nokmods)	2m 50s
main image (sericea, 38, nokmods)	3m 12s
main image (sericea, 38, kmods)	6m 2s
main image (sericea, 39, nokmods)	6m 25s
main image (sericea, 40, nokmods)	2m 17s
main image (onyx, 39, nokmods)	3m 17s
main image (onyx, 40, nokmods)	3m 0s
main image (base, 38, nokmods)	3m 18s
main image (base, 38, kmods)	5m 56s
main image (base, 39, nokmods)	2m 47s
main image (base, 40, nokmods)	2m 7s
main image (lxqt, 38, nokmods)	4m 4s
main image (lxqt, 38, kmods)	6m 53s
main image (lazurite, 39, nokmods)	6m 46s
main image (lazurite, 40, nokmods)	2m 35s
main image (mate, 38, nokmods)	5m 1s
main image (mate, 38, kmods)	7m 3s
main image (mate, 39, nokmods)	4m 19s
main image (vauxite, 38, nokmods)	3m 51s
main image (vauxite, 38, kmods)	6m 23s
main image (vauxite, 39, nokmods)	3m 14s
main image (vauxite, 40, nokmods)	3m 42s
Check all builds successful	1s
	2h 3m 49s

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