Update build-openwrt.yml

Author: hubbylei

.github/workflows/build-openwrt.yml

@@ -116,8 +116,8 @@ jobs:
       id: compile
       run: |
         cd ${GITHUB_WORKSPACE}/openwrt
-        echo -e "$(nproc) thread compile"
-        make -j$(nproc) || make -j1 V=s
+        echo -e "$(($(nproc) * 2)) thread compile"
+        make -j$(($(nproc) * 2)) || make -j1 V=s
         echo "status=success" >> $GITHUB_OUTPUT
         grep '^CONFIG_TARGET.*DEVICE.*=y' .config | sed -r 's/.*DEVICE_(.*)=y/\1/' > DEVICE_NAME
         [ -s DEVICE_NAME ] && echo "DEVICE_NAME=_$(cat DEVICE_NAME)" >> $GITHUB_ENV