feat: enable preview of Fedora 40 main builds #1161

Job	Run time
main image (silverblue, 38, nokmods)	3m 5s
main image (silverblue, 38, kmods)	7m 7s
main image (silverblue, 39, nokmods)	3m 18s
main image (silverblue, 40, nokmods)	1m 19s
main image (kinoite, 38, nokmods)	3m 18s
main image (kinoite, 38, kmods)	9m 25s
main image (kinoite, 39, nokmods)	3m 1s
main image (kinoite, 40, nokmods)	1m 39s
main image (sericea, 38, nokmods)	3m 51s
main image (sericea, 38, kmods)	5m 59s
main image (sericea, 39, nokmods)	2m 53s
main image (sericea, 40, nokmods)	1m 15s
main image (onyx, 39, nokmods)	3m 46s
main image (onyx, 40, nokmods)	1m 34s
main image (base, 38, nokmods)	2m 53s
main image (base, 38, kmods)	5m 24s
main image (base, 39, nokmods)	2m 35s
main image (base, 40, nokmods)	1m 8s
main image (lxqt, 38, nokmods)	4m 2s
main image (lxqt, 38, kmods)	6m 42s
main image (lazurite, 39, nokmods)	3m 1s
main image (lazurite, 40, nokmods)	1m 30s
main image (mate, 38, nokmods)	4m 16s
main image (mate, 38, kmods)	6m 52s
main image (mate, 39, nokmods)	3m 52s
main image (mate, 40, nokmods)	1m 9s
main image (vauxite, 38, nokmods)	3m 30s
main image (vauxite, 38, kmods)	6m 18s
main image (vauxite, 39, nokmods)	3m 26s
main image (vauxite, 40, nokmods)	1m 36s
Check all builds successful	1s
	1h 49m 45s

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