Add CI compiling rustc #3123

Job	Run time
spell_check	11s
build_system	24s
duplicates	5s
build (gcc-15-without-int128.deb, --std-tests)	6m 6s
build (gcc-15-without-int128.deb, --extended-regex-tests)	16m 13s
build (gcc-15.deb, --extended-rand-tests)	8m 47s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	13m 48s
build (gcc-15.deb, --test-libcore)	20m 49s
build (gcc-15.deb, --extended-regex-example-tests)	6m 41s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	14m 23s
build (gcc-15.deb, --std-tests)	5m 51s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	13m 51s
build (gcc-15.deb, --extended-regex-tests)	11m 31s
build (gcc-15.deb, --projects)	11m 4s
build (gcc-15-without-int128.deb, --extended-regex-example-tests)	6m 36s
build (gcc-15-without-int128.deb, --extended-rand-tests)	8m 33s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	13m 51s
build (gcc-15-without-int128.deb, --projects)	11m 39s
build (gcc-15-without-int128.deb, --test-libcore)	16m 37s
success	3s
	3h 7m 3s

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