Delete old Mastodon media cache every day

This is done using a systemd timer

Closes #533

site-cookbooks/kosmos-mastodon/recipes/default.rb

@@ -265,6 +265,41 @@ service "mastodon-streaming" do
   action [:enable, :start]
 end
 
+# Delete old media cache
+systemd_unit 'mastodon-delete-old-media-cache.service' do
+  content({
+    Unit: {
+      Description: 'Delete old Mastodon media cache'
+    },
+    Service: {
+      Type: "oneshot",
+      WorkingDirectory: "#{mastodon_path}",
+      Environment: "\"RAILS_ENV=#{rails_env}\"",
+      ExecStart: "#{bundle_path} exec bin/tootctl media remove --days 30",
+      SyslogIdentifier: "mastodon-delete-old-media-cache"
+    }
+  })
+  action [:create]
+end
+
+systemd_unit 'mastodon-delete-old-media-cache.timer' do
+  content({
+    Unit: {
+      Description: 'Delete old Mastodon media cache'
+    },
+    Timer: {
+      OnCalendar: '*-*-* 00:00:00',
+      Persistent: 'true'
+    },
+    Install: {
+      WantedBy: 'timers.target'
+    }
+  })
+
+  triggers_reload true
+  action [:create, :enable, :start]
+end
+
 firewall_rule "mastodon_app" do
   port     node['kosmos-mastodon']['app_port']
   source   "10.1.1.0/24"