Add CI compiling rustc #3141

Job	Run time
duplicates	3s
spell_check	10s
build_system	24s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	13m 54s
build (gcc-15.deb, --projects)	11m 1s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	14m 46s
build (gcc-15-without-int128.deb, --extended-rand-tests)	8m 29s
build (gcc-15.deb, --std-tests)	5m 53s
build (gcc-15.deb, --test-libcore)	16m 0s
build (gcc-15-without-int128.deb, --test-libcore)	17m 2s
build (gcc-15.deb, --extended-regex-example-tests)	6m 25s
build (gcc-15-without-int128.deb, --std-tests)	6m 1s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	13m 59s
build (gcc-15-without-int128.deb, --extended-regex-example-tests)	6m 40s
build (gcc-15-without-int128.deb, --projects)	11m 27s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	14m 3s
build (gcc-15.deb, --extended-regex-tests)	11m 42s
build (gcc-15.deb, --extended-rand-tests)	8m 30s
build (gcc-15-without-int128.deb, --extended-regex-tests)	12m 3s
success	4s
	2h 58m 36s

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