Add CI compiling rustc #3144

Job	Run time
build_system	25s
duplicates	4s
spell_check	7s
build (gcc-15.deb, --extended-regex-example-tests)	6m 7s
build (gcc-15.deb, --projects)	10m 53s
build (gcc-15.deb, --test-libcore)	15m 33s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	13m 45s
build (gcc-15.deb, --extended-regex-tests)	11m 21s
build (gcc-15.deb, --std-tests)	6m 10s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	13m 33s
build (gcc-15.deb, --extended-rand-tests)	8m 46s
build (gcc-15-without-int128.deb, --extended-rand-tests)	8m 34s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	16m 20s
build (gcc-15-without-int128.deb, --extended-regex-tests)	11m 33s
build (gcc-15-without-int128.deb, --projects)	11m 1s
build (gcc-15-without-int128.deb, --std-tests)	6m 9s
build (gcc-15-without-int128.deb, --extended-regex-example-tests)	6m 27s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	14m 9s
build (gcc-15-without-int128.deb, --test-libcore)	16m 32s
success	3s
	2h 57m 32s

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