Fix reported nit on build workflow

Author: yuvipanda

.github/workflows/build.yml

@@ -136,10 +136,12 @@ jobs:
         # 3. Putting the robot account's username and password in GitHub actions environment
         if: env.PUBLIC == 'true'
         run: |
-          docker login -u "${{ secrets.QUAY_USERNAME }}" -p "${{ secrets.QUAY_PASSWORD }}" "${{ env.REGISTRY }}"
+          docker login -u "${{ secrets.QUAY_USERNAME }}" -p "${{ secrets.QUAY_PASSWORD }}" "${REGISTRY}"
           if [ "${{ env.PUBLISH_DOCKERIO }}" = "true" ]; then
             docker login -u "${{ secrets.DOCKERHUB_USERNAME }}" -p "${{ secrets.DOCKERHUB_TOKEN }}" docker.io
           fi
+        env:
+          REGISTRY: ${{ env.REGISTRY }}
 
       # image: env.IMAGE
       #