Add golangci-lint with linters disabled

misc/git/hooks/golangci-lint

@@ -0,0 +1,26 @@
+#!/bin/bash
+# Copyright 2019 The Vitess 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.
+
+# Unfortunately golangci-lint does not work well on checking just modified files.
+# We will enable it for everything here, but with most of the linters disabled.
+# See: https://github.com/vitessio/vitess/issues/5503
+
+GOLANGCI_LINT=$(command -v golangci-lint >/dev/null 2>&1)
+if [ $? -eq 1 ]; then
+  echo "Downloading golangci-lint..."
+  curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.21.0
+fi
+
+golangci-lint run --disable=ineffassign,unused,gosimple,staticcheck,errcheck,structcheck,varcheck,deadcode