Update AZD template validation workflow to use variable for OpenAI location

Author: Pavan-Microsoft

.github/workflows/azure-dev.yml

@@ -17,7 +17,7 @@ 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
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}