Add CI compiling rustc #63

Job	Run time
build (m68k-unknown-linux-gnu, m68k, http://ftp.ports.debian.org/debian-ports, https://github.com...	1h 51m 33s
build (x86_64-unknown-linux-gnu, https://github.com/rust-lang/gcc/releases/latest/download/gcc-15...	52m 48s
	2h 44m 21s

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