tools/ci: Add Rust Target for QEMU RISC-V 64-bit

[lupyuen]

Summary

This PR updates the Docker Image for NuttX CI, so that it builds Rust Apps correctly for QEMU RISC-V 64-bit. We add the Rust Target for riscv64gc-unknown-none-elf to the Docker Image.

In the next PR, we will call the Updated Docker Image to compile the Rust App leds_rust, at every run of NuttX CI. This will validate whether Rust Apps are built correctly for QEMU RISC-V 64-bit.

Modified Files

tools/ci/docker/linux/Dockerfile: Add Rust Target riscv64gc-unknown-none-elf for Docker CI

tools/ci/platforms/ubuntu.sh: Same as above, but for Ubuntu CI

tools/ci/platforms/msys2.sh: Same as above, but for MSYS2 CI

Impact

No impact on existing CI, since the Rust Target riscv64gc-unknown-none-elf is not used by existing code.

Testing

We tested the CI Docker Image by rebuilding it (only the essential parts), and running the CI Build for rv-virt:*. Which successfully compiles rv-virt:leds64_rust and the Rust App leds_rust:

• Docker Build Log
• Docker Build Instructions

$ cd nuttx/tools/ci/docker/linux
$ docker build -t nuttx:v1 .
$ docker run -it nuttx:v1 /bin/bash 
# cd
# git clone https://github.com/lupyuen2/wip-nuttx nuttx --branch safer-rust-blinky9
# git clone https://github.com/apache/nuttx-apps apps
# cd nuttx/tools/ci
# ./cibuild.sh -c -A -N -R testlist/risc-v-02.dat

Configuration/Tool: rv-virt/leds64_rust
  Cleaning...
  Configuring...
  Building NuttX...
riscv-none-elf-ld: warning: /root/nuttx/nuttx has a LOAD segment with RWX permissions
  Normalize rv-virt/leds64_rust