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Add dependancy on step-cli

- CVE-2021-22922
- CVE-2021-22923
- CVE-2021-22924
- CVE-2021-22925

Dependency is lacking riscv64 support.

See: https://github.com/elastic/go-concert/issues/51

aarch64 and riscv64 both use the syscall numbers defined in
uapi/asm-generic/unistd.h in the kernel tree. As such, it is trivial to
also add support for riscv64 based on the aarch64 patch.

Should fix testing/yodl build on riscv64.