pull-test.sh: test importing csi-release-tools into other repo

This will be used by special Prow pull
jobs (kubernetes/test-infra#21995) to ensure
that an update csi-release-tools works in consuming repos.

pull-test.sh

@@ -0,0 +1,32 @@
+#! /bin/sh
+#
+# Copyright 2021 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script is called by pull Prow jobs for the csi-release-tools
+# repo to ensure that the changes in the PR work when imported into
+# some other repo.
+
+set -ex
+
+# It must be called inside the updated csi-release-tools repo.
+CSI_RELEASE_TOOLS_DIR="$(pwd)"
+
+# Update the other repo.
+cd "$PULL_TEST_REPO_DIR"
+git subtree pull --squash --prefix=release-tools "$CSI_RELEASE_TOOLS_DIR" master
+git log -n2
+
+# Now fall through to testing.
+exec ./.prow.sh