add back Blazor variable substitution

.github/workflows/template-web.yml

@@ -17,6 +17,23 @@ jobs:
         with:
           creds: ${{ secrets.AZURE_CREDENTIALS }}
 
+      - name: Set backend env variables
+        uses: azure/powershell@v1
+        with:
+          azPSVersion: "latest"
+          inlineScript: |
+            az extension add --name containerapp
+            $apiUrl = "https://$(az containerapp show -g ${{ secrets.AZURE_RESOURCE_GROUP_NAME }} -n ${{ secrets.API_RESOURCE_NAME }} -o tsv --query properties.configuration.ingress.fqdn)"
+            echo "PODCAST_API_URL=$apiUrl" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf-8 -Append
+
+      - name: Set Blazor WASM app settings
+        uses: microsoft/variable-substitution@v1
+        with:
+          files: "src/Web/Client/wwwroot/appsettings.json"
+        env:
+          PodcastApi.BaseAddress: ${{ env.PODCAST_API_URL }}
+          ListenTogetherHub: "https://${{secrets.HUB_WEBAPP_NAME}}.azurewebsites.net/listentogether"
+
       - name: Deploy Bicep template
         uses: azure/powershell@v1
         with: