Update Dockerfile

Dockerfile

@@ -1,6 +1,6 @@
 FROM neosmemo/memos:stable
 RUN apk update && apk upgrade && apk add git wget nodejs npm
-RUN chmod -R u+rwx,g+rwx,o+rwx /var/opt
+RUN chmod -R u+rwx,g+rwx,o+rwx /var/opt && rm -rf /var/opt/memos
 RUN chmod -R u+rwx,g+rwx,o+rwx /tmp
 RUN mkdir -p /.npm
 RUN chmod -R u+rwx,g+rwx,o+rwx /.npm