Updated certificate binding instructions.

README.md

@@ -18,11 +18,9 @@ You have to be authenticated in Azure CLI. The app will block terminal and start
 ## Add Certificate Binding
 
 ```shell
-az containerapp hostname bind \
-    --hostname $DOMAIN_NAME \
-    -g $RESOURCE_GROUP \
-    -n $CONTAINER_APP \
-    --environment $ENVIRONMENT \
-    --certificate $CERTIFICATE_LOWERCASE_NAME \
-    --validation-method CNAME
+# Find the certificate name
+CERTIFICATE_LOWERCASE_NAME=$(az containerapp env certificate list -g $RESOURCE_GROUP -n $ENVIRONMENT --query '[].name' -o tsv)
+
+# Bind the certificate to the container app
+az containerapp hostname bind --hostname $DOMAIN_NAME -g $RESOURCE_GROUP -n $CONTAINER_APP --environment $ENVIRONMENT --certificate $CERTIFICATE_LOWERCASE_NAME --validation-method CNAME
 ```