gh actions: add riscv32 bot #2666

Job	Run time
linux-compiler-compatible (clang, Debug, libc++)	11m 15s
mac-compiler-compatible (macos-14, Debug)	8m 43s
mingw64-compiler-compatible-crosscompiling (i686, Debug)	22m 23s
linux-compiler-compatible (clang, Release, libc++)	9m 41s
mac-compiler-compatible (macos-14, Release)	6m 44s
mingw64-compiler-compatible-crosscompiling (i686, Release)	19m 59s
mingw64-compiler-compatible-crosscompiling (x86_64, Debug)	20m 51s
win-compiler-compatible-2022 (x86, dynamic, Debug)	30m 35s
mingw64-compiler-compatible-crosscompiling (x86_64, Release)	20m 33s
win-compiler-compatible-2022 (x86, dynamic, Release)	28m 32s
	2h 59m 16s

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