Add data directory creation with permissions in Dockerfile

Dockerfile

@@ -8,6 +8,10 @@ ENV QUERY_DEFAULTS_LIMIT=25 \
 
 EXPOSE 8080 50051
 
+# Create data directory with proper permissions
+RUN mkdir -p /var/lib/weaviate && \
+    chmod 777 /var/lib/weaviate
+
 # Create volume for persistent data
 VOLUME ["/var/lib/weaviate"]