Update CI to run full build script

Replace the workflow’s bootloader-only make step with the shared `scripts/build_all.sh` command. This makes CI use the centralized build path and compile all targets instead of only `bootloader-tftp`.

Author: vanvught

.github/workflows/c-cpp.yml

@@ -31,9 +31,7 @@ jobs:
         echo "$TOOLCHAIN_DIR/bin" >> "$GITHUB_PATH"
     - name: version
       run: arm-none-eabi-g++ --version
-    - name: make bootloader-tftp
+    - name: build all
       run: |
-        cd bootloader-tftp
-        make -f Makefile.GD32 clean
-        make -f Makefile.GD32
-        cd -
+        cd scripts
+        ./build_all.sh