Add CI compiling rustc #50

Job	Run time
build (x86_64-unknown-linux-gnu, https://github.com/rust-lang/gcc/releases/latest/download/gcc-15...	48m 19s
build (m68k-unknown-linux-gnu, m68k, https://github.com/rust-lang/gcc/releases/latest/download/gc...	42m 1s
	1h 30m 20s

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