Update build.yml

Author: sfe-SparkFro

.github/workflows/build.yml

@@ -22,9 +22,9 @@ jobs:
     - name: Set Pico SDK path
       run: echo "PICO_SDK_PATH=$GITHUB_WORKSPACE/micropython/lib/pico-sdk" >> "$GITHUB_ENV"
     - name: Build OpenCV
-      run: make -C src/opencv PLATFORM=embedded/rp2350 --no-print-directory
+      run: make -C src/opencv PLATFORM=embedded/rp2350 --no-print-directory -j4
     - name: Build firmware
-      run: make BOARD=SPARKFUN_XRP_CONTROLLER
+      run: make BOARD=SPARKFUN_XRP_CONTROLLER -j4
     - name: Upload UF2
       uses: actions/upload-artifact@v4
       with: