Don't remove tar as other packages depend on it

pica-dokuwiki/Dockerfile

@@ -27,7 +27,7 @@ RUN apt-get update -y && \
     chown -R www-data . && \
     chmod +x /run.sh && \
     sed -i "s/\${MAXSIZE}/100M/g" /etc/nginx/nginx.conf && \
-    apt-get remove wget tar && \
+    apt-get remove -y wget && \
     apt-get clean
 
 EXPOSE 80