Fix: Don't create storage directory in Dockerfile

- Removed mkdir command that was creating /app/code/storage
- This allows ln -sf to create the symlink correctly
- Previously ln was creating /app/code/storage/storage instead

Dockerfile

@@ -55,9 +55,8 @@ RUN cd /app/code && \
     rm -rf node_modules && \
     chown -R cloudron:cloudron /app/code/public
 
-# Remove storage directory as it will be mounted from /run
-RUN rm -rf /app/code/storage && \
-    mkdir -p /app/code/storage
+# Remove storage directory - will be symlinked to /app/data/storage in start.sh
+RUN rm -rf /app/code/storage
 
 # Copy configuration files
 COPY nginx.conf /etc/nginx/sites-available/default