Playbook string env fix (#2555)

Author: yk

ansible/inference/deploy-server.yaml

@@ -151,7 +151,7 @@
             default(100, true) }}"
           ENABLE_SAFETY:
             "{{ lookup('ansible.builtin.env', 'INFERENCE_ENABLE_SAFETY') |
-            default('False', true) }}"
+            default('False', true) | string }}"
           GUNICORN_WORKERS:
             "{{ lookup('ansible.builtin.env', 'INFERENCE_GUNICORN_WORKERS') |
             default(1, true) }}"