Add docker image for uploading a file to gcp

gcp-backup-upload/script.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+set -euo pipefail
+
+until [ -f ${FILE_TO_TRIGGER} ]
+do
+     sleep 5
+done
+
+gcloud auth activate-service-account --key-file ${GCLOUD_KEY_FILE};
+
+gcloud storage cp ${FILE_TO_BACKUP} ${BUCKET_URL}/;