Fix njs command line test

Author: justdan6

.github/workflows/dockerimage.yml

@@ -113,7 +113,7 @@ jobs:
 
     - name: Test njs command line
       run: |
-        echo "console.log('Using njs v' + njs.version)" | docker run -i --rm justdanz/nginx njs -q | grep "Using njs v0.8.3"
+        echo "console.log('Using njs v' + njs.version)" | docker run -i --rm justdanz/nginx njs -q - | grep "Using njs v0.8.3"
 
     - name: Show logs
       if: always()