fix: correct issues with dockerfile

daemon/Dockerfile

@@ -69,8 +69,8 @@ ENV RT_XMLRPC_PORT="5000"
 
 RUN adduser -u 1000 -D rtorrent && \
     addgroup rtorrent rtorrent && \
-    mkdir /data && chown rtorrent /data && \
-    mkdir /private && chown rtorrent /private
+    mkdir -p /data && chown rtorrent /data && \
+    mkdir -p /private && chown rtorrent /private
 
 USER rtorrent