Really fix dockerfile

Author: DavidMStraub

Dockerfile

@@ -41,7 +41,7 @@ RUN mkdir /app/static && touch /app/static/index.html
 RUN mkdir /app/db && mkdir /app/media && mkdir /app/indexdir && mkdir /app/users
 RUN mkdir /app/thumbnail_cache
 RUN mkdir /app/cache && mkdir /app/cache/reports && mkdir /app/cache/export \
-    && /app/cache/request_cache && /app/cache/persistent_cache
+    && mkdir /app/cache/request_cache && mkdir /app/cache/persistent_cache
 RUN mkdir /app/tmp && mkdir /app/persist
 RUN mkdir -p /root/gramps/gramps$GRAMPS_VERSION/plugins
 # set config options