Github actions: change Ubuntu 24.04 build to debug for now. #250

Job	Run time
osx-build-arm64	11m 43s
osx-build	15m 3s
cygwin-build	0s
linux-build-docker (ubuntu, 24.04, no, debug, qfsbuild)	15m 28s
linux-build-docker (ubuntu, 22.04, no, release, qfsbuild)	15m 44s
rat	12s
linux-build-docker (ubuntu, 20.04, no, release, qfsbuild)	16m 56s
linux-build-docker (ubuntu, 18.04, no, release, qfsbuild)	14m 49s
linux-build-docker (ubuntu, 18.04, yes, release, qfsbuild)	16m 16s
linux-build-docker (ubuntu, 18.04, no, debug, qfsbuild)	14m 39s
linux-build-docker (ubuntu, 18.04, no, release, root)	15m 4s
linux-build-docker (ubuntu, 16.04, no, release, qfsbuild)	14m 50s
linux-build-docker (ubuntu, 14.04, no, release, qfsbuild)	12m 58s
linux-build-docker (debian, 10, no, release, qfsbuild)	15m 49s
linux-build-docker (centos, 6, no, release, qfsbuild)	13m 42s
linux-build-docker (centos, 7, no, release, qfsbuild)	15m 20s
linux-build-docker (centos, 8, no, release, qfsbuild)	15m 46s
linux-build-docker (i386/ubuntu, 18.04, no, release, qfsbuild)	17m 17s
	4h 1m 36s

Provide feedback