Update r3g-openwrt.yml

Author: Calmact

.github/workflows/r3g-openwrt.yml

@@ -110,7 +110,7 @@ jobs:
       run: |
         cd openwrt
         echo -e "$(nproc) thread compile"
-        make -j2 V=s
+        make -j1 V=s
         echo "::set-output name=status::success"
         grep '^CONFIG_TARGET.*DEVICE.*=y' .config | sed -r 's/.*DEVICE_(.*)=y/\1/' > DEVICE_NAME
         [ -s DEVICE_NAME ] && echo "DEVICE_NAME=_$(cat DEVICE_NAME)" >> $GITHUB_ENV