Rotate selfoss logs

My selfoss logs were using 10GB of space because they weren't being rotated properly.

roles/news/files/etc_logrotate_selfoss

@@ -0,0 +1,8 @@
+/var/www/selfoss/data/logs/*.log {
+        daily
+        missingok
+        rotate 5
+        compress
+        notifempty
+        create 0644 www-data www-data
+}

roles/news/tasks/selfoss.yml

@@ -41,3 +41,6 @@
 
 - name: Install selfoss cronjob
   cron: name="selfoss" user="www-data" minute="*/5" job="curl --silent --show-error -k 'https://{{ selfoss_domain }}/update' > /dev/null"
+
+- name: Configure selfoss logrotate
+  copy: src=etc_logrotate_selfoss dest=/etc/logrotate.d/selfoss owner=root group=root mode=0644