Minimal env to get ch32v003 working with gcc
Requires:
https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases/tag/v12.2.0-3/
if you are tired of platform.io
https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases/tag/v12.2.0-3/
if you are tired of platform.io