Removed the cleanup part as it won't have desired effect if running build-time.

Also removed unnecessary "-rf" for the archive removal.

Dockerfile

@@ -28,9 +28,7 @@ RUN wget -q -O /dokuwiki.tgz "http://download.dokuwiki.org/src/dokuwiki/dokuwiki
     if [ "$DOKUWIKI_CSUM" != "$(md5sum /dokuwiki.tgz | awk '{print($1)}')" ];then echo "Wrong md5sum of downloaded file!"; exit 1; fi && \
     mkdir /dokuwiki && \
     tar -zxf dokuwiki.tgz -C /dokuwiki --strip-components 1 && \
-    rm -rf dokuwiki.tgz && \
-    cd /dokuwiki && \
-    grep -Ev '^($|#)' data/deleted.files | xargs -n 1 rm -vrf
+    rm dokuwiki.tgz
 
 # Set up ownership
 RUN chown -R www-data:www-data /dokuwiki