CI: Prepare Rust modules

Adding Rust architecture modules for ensure compilation.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Author: soburi

.github/workflows/build.yml

@@ -39,6 +39,12 @@ jobs:
         run: |
           git clone https://github.com/arduino/ArduinoCore-API.git $MODULE_PATH/../ArduinoCore-API
           cp -rfp $MODULE_PATH/../ArduinoCore-API/api $MODULE_PATH/cores/arduino/
+          apt install rustup
+          rustup default stable
+          rustup target add thumbv6m-none-eabi
+          rustup target add thumbv7em-none-eabihf
+          rustup target add thumbv7em-none-eabi
+          rustup target add thumbv7m-none-eabi
 
       - name: Build fade
         run: |