ci: add volumesnapshotclasses for externalstorage

added volumesnapshotclasses yaml and script for
external-storage test

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

scripts/k8s-storage/create-volumesnapshotclasses.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+#
+# Create VolumeSnapshotClasses from a template (volumesnapshotclass-*.yaml.in) and replace keywords
+# like @@CLUSTER_ID@@.
+#
+# These VolumeSnapshotClasses can then be used by driver-*.yaml manifests in the
+# k8s-e2e-external-storage CI job.
+#
+# Requirements:
+# - kubectl in the path
+# - working KUBE_CONFIG either in environment, or default config files
+# - deployment done with Rook
+#
+
+# exit on error
+set -e
+
+WORKDIR=$(dirname "${0}")
+
+TOOLBOX_POD=$(kubectl -n rook-ceph get pods --no-headers -l app=rook-ceph-tools -o=jsonpath='{.items[0].metadata.name}')
+FS_ID=$(kubectl -n rook-ceph exec "${TOOLBOX_POD}" -- ceph fsid)
+
+for sc in "${WORKDIR}"/volumesnapshotclass-*.yaml.in
+do
+	sed "s/@@CLUSTER_ID@@/${FS_ID}/" "${sc}" |
+		kubectl create -f -
+done