Scripts: Add tool to cleanup docker resources.

docker/scripts/cleanup_resources.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+###############################################################################
+# Copyright 2018 The Apollo Authors. All Rights Reserved.
+#
+# 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.
+###############################################################################
+
+if [ ! -z ${DOCKER_IMG} ]; then
+  echo "This script is expected to be run on host instead of the container."
+  echo "Please exit."
+  exit 1
+fi
+
+# Credit to https://gist.github.com/bastman/5b57ddb3c11942094f8d0a97d461b430
+echo "Cleanup containers..."
+docker rm $(docker ps -qa --no-trunc --filter "status=exited")
+
+echo "Cleanup images..."
+docker rmi $(docker images --filter "dangling=true" -q --no-trunc)
+
+echo "Cleanup volumes..."
+docker volume rm $(docker volume ls -qf dangling=true)