Reduce parallel jobs and add swap in case we are hitting github action limitations

.github/workflows/build-image-v5.yaml

@@ -21,6 +21,19 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
 
+      - name: Add swap space
+        run: |
+          sudo fallocate -l 4G /swapfile
+          sudo chmod 600 /swapfile
+          sudo mkswap /swapfile
+          sudo swapon /swapfile
+          free -h
+
+      - name: Set MAKEFLAGS for parallel make jobs
+        run: |
+          export MAKEFLAGS="-j2"
+          echo "MAKEFLAGS set to: $MAKEFLAGS"
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
         with: