Update AZD template validation workflow to use environment variable for OpenAI location

Author: Pavan-Microsoft

.github/workflows/azd-template-validation.yml

@@ -29,7 +29,7 @@ jobs:
           AZURE_SUBSCRIPTION_ID: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
           AZURE_ENV_NAME: ${{ vars.AZURE_ENV_NAME }}
           AZURE_LOCATION: ${{ vars.AZURE_LOCATION }}
-          AZURE_ENV_OPENAI_LOCATION : ${{ secrets.AZURE_AI_DEPLOYMENT_LOCATION }}
+          AZURE_ENV_OPENAI_LOCATION : ${{ vars.AZURE_AI_DEPLOYMENT_LOCATION }}
           AZURE_ENV_MODEL_CAPACITY: 1
           AZURE_ENV_MODEL_4_1_CAPACITY: 1 # keep low to avoid potential quota issues
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}