Fixed CI on MACOS to get nproc appropriately

Author: AjayBrahmakshatriya

.github/workflows/ci-all-samples.yml

@@ -21,5 +21,5 @@ jobs:
       - run: echo "Starting tests"
       - name: Checking out repository
         uses: actions/checkout@v2
-      - run: make -C ${{ github.workspace }} -j$(nproc) run
+      - run: make -C ${{ github.workspace }} -j$(sysctl -n hw.physicalcpu) run
       - run: echo "Tests completed"