automatically run collector on container startup.

fixes #73

rootfs/etc/services.d/collector-once/run

@@ -0,0 +1,14 @@
+#!/usr/bin/with-contenv bash
+
+echo "waiting for scrutiny service to start"
+s6-svwait -u /var/run/s6/services/scrutiny
+
+#tell s6 to only run this script once
+s6-svc -O /var/run/s6/services/collector-once
+
+# wait until scrutiny is "Ready"
+while [[ "$(curl -s -o /dev/null -w ''%{http_code}'' http://localhost:8080/api/health)" != "200" ]]; do sleep 5; done
+
+
+echo "starting scrutiny collector"
+/scrutiny/bin/scrutiny-collector-metrics run