Update build-docker-image.yml

Author: Prajwal-Microsoft

.github/workflows/build-docker-image.yml

@@ -40,7 +40,7 @@ jobs:
         run: |
           BRANCH="${{ github.ref_name }}"
           DATE="${{ steps.date.outputs.date }}"
-          GITHUB_RUN_NUMBER: "${{ github.run_number }}"
+          GITHUB_RUN_NUMBER="${{ github.run_number }}"
           if [[ "$BRANCH" == "main" ]]; then
             BASE_TAG="latest"
           elif [[ "$BRANCH" == "dev" ]]; then