Add a cleanup worker for blob uploads

conf/init/service/blobuploadcleanupworker/log/run

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+# Ensure dependencies start before the logger
+sv check syslog-ng > /dev/null || exit 1
+
+# Start the logger
+exec logger -i -t blobuploadcleanupworker

conf/init/service/blobuploadcleanupworker/run

@@ -0,0 +1,8 @@
+#! /bin/bash
+
+echo 'Starting Blob upload cleanup worker'
+
+cd /
+venv/bin/python -m workers.blobuploadcleanupworker 2>&1
+
+echo 'Blob upload cleanup exited'