Add Makefile and a note in README.md

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

hack/tools/.gitignore

@@ -0,0 +1 @@
+vendor/

hack/tools/Makefile

@@ -0,0 +1,65 @@
+# Copyright 2020 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.
+
+export GO111MODULE=on
+
+GOBIN ?= $(shell go env GOPATH)/bin
+DEP_PROGS=\
+	$(GOBIN)/buildozer\
+	$(GOBIN)/gazelle\
+	$(GOBIN)/golint\
+	$(GOBIN)/gotestsum\
+	$(GOBIN)/kazel\
+	$(GOBIN)/misspell\
+	$(GOBIN)/prettybench\
+	$(GOBIN)/staticcheck\
+
+.PHONY: all
+all: clean build
+
+.PHONY: clean
+clean:
+	rm -f $(DEP_PROGS)
+	rm -rf vendor/
+
+.PHONY: build
+build: $(DEP_PROGS)
+
+.PHONY: deps
+deps:
+	go mod vendor
+
+$(GOBIN)/buildozer: deps
+	go install github.com/bazelbuild/buildtools/buildozer
+
+$(GOBIN)/gazelle: deps
+	go install github.com/bazelbuild/bazel-gazelle/cmd/gazelle
+
+$(GOBIN)/golint: deps
+	go install golang.org/x/lint/golint
+
+$(GOBIN)/gotestsum: deps
+	go install gotest.tools/gotestsum
+
+$(GOBIN)/kazel: deps
+	go install k8s.io/repo-infra/cmd/kazel
+
+$(GOBIN)/misspell: deps
+	go install github.com/client9/misspell/cmd/misspell
+
+$(GOBIN)/prettybench: deps
+	go install github.com/cespare/prettybench
+
+$(GOBIN)/staticcheck: deps
+	go install honnef.co/go/tools/cmd/staticcheck

hack/tools/README.md

@@ -1,2 +1,5 @@
 This directory contains a stub go module used to track version of development
 tools like the ones needed for updating bazel BUILD files.
+
+Run `make build` to download the dependencies, build the binaries and add
+them to your `$GOBIN` directory.