feat: add riscv64 client (#1922) #790

Job	Run time
check	12s
compile	13m 33s
reh_alpine (x64, x64)	4m 50s
reh_linux (x64, x64)	5m 35s
reh_alpine (arm64, arm64)	11m 8s
build (x64, x64, vscodium/vscodium-linux-build-agent:bionic-x64)	4m 1s
reh_linux (arm64, arm64)	12m 24s
build (arm64, arm64, vscodium/vscodium-linux-build-agent:bionic-arm64)	4m 56s
reh_linux (armhf, arm)	5m 33s
build (armhf, arm, vscodium/vscodium-linux-build-agent:bionic-armhf)	3m 48s
reh_linux (ppc64le, ppc64)	5m 24s
build (riscv64, riscv64, vscodium/vscodium-linux-build-agent:focal-riscv64)	3m 43s
reh_linux (riscv64, riscv64)	5m 59s
snap	0s
deb-rpm-repo-hook	0s
aur	0s
	1h 21m 6s

Provide feedback