Implement a worker for batch exporting of usage logs

This will allow customers to request their usage logs for a repository or an entire namespace, and we can export the logs in a manner that doesn't absolutely destroy the database, with every step along the way timed.

conf/init/service/batch/exportactionlogsworker/log/run

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# Start the logger
+exec logger -i -t exportactionlogsworker

conf/init/service/batch/exportactionlogsworker/run

@@ -0,0 +1,9 @@
+#! /bin/bash
+
+echo 'Starting Export Actions Log worker'
+
+QUAYPATH=${QUAYPATH:-"."}
+cd ${QUAYDIR:-"/"}
+PYTHONPATH=$QUAYPATH venv/bin/python -m workers.exportactionlogsworker 2>&1
+
+echo 'Export Actions Log worker exited'