Set up the service monitoring for the log migration script. Add a database migration to add the logs_archived column.

conf/init/buildlogsarchiver/log/run

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec svlogd /var/log/buildlogsarchiver/

conf/init/buildlogsarchiver/run

@@ -0,0 +1,8 @@
+#! /bin/bash
+
+echo 'Starting build logs archiver worker'
+
+cd /
+venv/bin/python -m workers.buildlogsarchiver
+
+echo 'Diffs worker exited'