Add riscv32 CI checks

[matetokodi]

No description provided.

[zherczeg]

LGTM

[ksh8281]

How about to set allow_failure flags on risc-v checks while fix risc-v issues?

[matetokodi]

I'd want to fix the riscv issues before this is merged;

I also noticed (in target.cmake) that for the tizen target x64, x86, arm, aarch64, and riscv64 are all supported, should I add riscv32 there too?

[ksh8281]

Sounds good!