www.lizard's system partition is too full

Originally created by @intrigeri on #12425 (Redmine)

This started on the last day of my last shift, and since then it has been going on, on and off, during the last 2 weeks while bertagaz was on duty. At first glance it seems that /var/log/nginx is the best place where we could save space.

Related issues

• Blocks tails/sysadmin#13232