Leave user wger as owner for db folder

The apache process still has the group permissions to write the sqlite file

docs/production.rst

@@ -88,7 +88,8 @@ If using sqlite, create a folder for it (must be writable by the apache user)::
 
   mkdir db
   touch db/database.sqlite
-  chmod -R o+w db
+  chown :www-data -R /home/wger/db
+  chmod g+w /home/wger/db /home/wger/db/database.sqlite
 
 Application
 -----------

extras/docker/apache/Dockerfile

@@ -100,6 +100,7 @@ RUN mkdir -p ~/static/CACHE ~/media \
 USER root
 RUN apt-get remove build-essential -y \
     && apt autoremove -y \
-    && chown www-data:www-data -R /home/wger/db
+    && chown :www-data -R /home/wger/db \
+    && chmod g+w /home/wger/db /home/wger/db/database.sqlite
 
 ENTRYPOINT ["/home/wger/entrypoint.sh"]