Add withih_iframe and create /data dir directly

Dockerfile

@@ -3,14 +3,12 @@ FROM aledsz/livebook:latest
 ENV LIVEBOOK_APP_SERVICE_NAME "🐳 Hugging Face - Livebook"
 ENV LIVEBOOK_APP_SERVICE_URL "https://huggingface.co/spaces/aleDsz/livebook"
 ENV LIVEBOOK_UPDATE_INSTRUCTIONS_URL "https://livebook.dev"
-ENV LIVEBOOK_ROOT_PATH "/data"
+ENV LIVEBOOK_WITHIN_IFRAME "true"
 ENV LIVEBOOK_DATA_PATH "/data"
 ENV LIVEBOOK_PORT 7860
-ENV LIVEBOOK_IFRAME_PORT 7861
 
 EXPOSE 7860
-EXPOSE 7861
 
-ADD ./data /data
 USER root
+RUN mkdir -p /data
 RUN chmod 777 /data