Add Rust build CI attach config

Add a rust attach config to the stm32f407-rt-spark BSP so GitHub CI
enables the Rust core and component-log example on a Cortex-M4 target,
exercising the Rust build scripts under compile supervision.

Install the Rust toolchain (rustup + thumbv7em-none-eabihf) on the
sourcery-arm legs of the BSP static build workflow so the attached
Rust configuration is actually compiled instead of skipped.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: yanhu7150-tech

.github/workflows/bsp_buildings.yml

@@ -280,6 +280,16 @@ jobs:
           /opt/i386-unknown-elf_for_x86_64-pc-linux-gnu/bin/i386-unknown-elf-gcc --version
           echo "RTT_EXEC_PATH=/opt/i386-unknown-elf_for_x86_64-pc-linux-gnu/bin" >> $GITHUB_ENV
 
+      - name: Install Rust ToolChains
+        if: ${{ matrix.legs.RTT_TOOL_CHAIN == 'sourcery-arm' && success() }}
+        shell: bash
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable --profile minimal
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+          "$HOME/.cargo/bin/rustup" target add thumbv7em-none-eabihf
+          "$HOME/.cargo/bin/rustc" --version
+          "$HOME/.cargo/bin/cargo" --version
+
       - name: Bsp Scons Compile
         if: ${{ success() }}
         shell: bash

bsp/stm32/stm32f407-rt-spark/.ci/attachconfig/ci.attachconfig.yml

@@ -230,3 +230,12 @@ component.cherryusb_cdc:
       - CONFIG_RT_CHERRYUSB_DEVICE_DWC2_ST=y
       - CONFIG_RT_CHERRYUSB_DEVICE_CDC_ACM=y
       - CONFIG_RT_CHERRYUSB_DEVICE_TEMPLATE_CDC_ACM=y
+# ------ rust CI ------
+rust:
+    <<: *scons
+    kconfig:
+      - CONFIG_RT_USING_RUST=y
+      - CONFIG_RT_RUST_CORE=y
+      - CONFIG_RT_USING_RUST_EXAMPLES=y
+      - CONFIG_RT_RUST_BUILD_COMPONENTS=y
+      - CONFIG_RUST_LOG_COMPONENT=y