ci: add riscv64 manylinux/musllinux wheels by justeph · Pull Request #664 · msgpack/msgpack-python

methane

Now that cibuildwheel and PyPI support riscv64, we can start building
riscv64 wheels.

Because there is no native riscv64 runner available, this PR adds a
QEMU-based riscv64 job to the cibuildwheel workflow.

Signed-off-by: Julien Stephan <jstephan@baylibre.com>