install kind for integration tests

this is pretty cheap/fast, kind is a very small go binary, and upgrades can now be tested with PRs to this repo

Author: BenTheElder

hack/tools/ensure-kind.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# Copyright 2024 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.
+
+# usage: source this script to ensure kind is setup
+
+# ensure kind is available for setup-kind-cluster.sh etc
+# TODO: consider factoring out the kind version used for CI or
+# else ensure all CI jobs use this script
+# TODO: consider enforcing a particular version locally as well to avoid confusion
+if ! command -v kind; then
+    local repo_gobin="${REPO_ROOT}/_bin"
+    GOBIN="${repo_gobin}" go install sigs.k8s.io/[email protected]
+    export PATH="${repo_gobin}:${PATH}"
+fi

test/integration/integration-test.sh

@@ -219,6 +219,7 @@ function main() {
   done
 
   if ((setup_kind_cluster)); then
+    source "${REPO_ROOT}"/hack/tools/ensure-kind.sh
     "${SCRIPT_ROOT}"/setup-kind-cluster.sh \
       -fakepubsub-node-port="${fakepubsub_node_port}"
   fi