fix the tag not found error

Author: Priyanka-Microsoft

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

@@ -31,7 +31,7 @@ jobs:
         if: ${{ github.ref_name == 'main' || github.ref_name == 'dev' || github.ref_name == 'demo' || github.ref_name == 'hotfix' }}
         uses: azure/docker-login@v2
         with:
-          login-server: ${{ env.ACR_LOGIN_SERVER }}
+          login-server: ${{ env.ACR_LOGIN_SERVER || 'acrlogin.azurecr.io' }}
           username: ${{ env.ACR_USERNAME }}
           password: ${{ env.ACR_PASSWORD }}