Fix dockerfile

Author: DavidMStraub

Dockerfile

@@ -39,8 +39,9 @@ ENV OMP_NUM_THREADS=1
 RUN mkdir /app/src &&  mkdir /app/config && touch /app/config/config.cfg
 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 && mkdir /app/request_cache && mkdir /app/cache/persistent_cache
-RUN mkdir /app/cache && mkdir /app/cache/reports && mkdir /app/cache/export
+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
 RUN mkdir /app/tmp && mkdir /app/persist
 RUN mkdir -p /root/gramps/gramps$GRAMPS_VERSION/plugins
 # set config options