Terraform release (#4613)

* Add script to build the ingress controller image using terraform

* Update terraform to 0.12.9

build/build-ingress-controller.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+# Copyright 2019 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.
+
+if [ -n "$DEBUG" ]; then
+	set -x
+fi
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+DIR=$(cd $(dirname "${BASH_SOURCE}") && pwd -P)
+
+AWS_FILE="${DIR}/images/nginx/aws.tfvars"
+ENV_FILE="${DIR}/images/nginx/env.tfvars"
+
+if [ ! -f "${AWS_FILE}" ]; then
+  echo "File $AWS_FILE does not exist. Please create this file with keys access_key an secret_key"
+  exit 1
+fi
+
+if [ ! -f "${ENV_FILE}" ]; then
+  echo "File $ENV_FILE does not exist. Please create this file with keys docker_username and docker_password"
+  exit 1
+fi
+
+# build local terraform image to build nginx
+docker build -t build-ingress-controller-terraform $DIR/images/ingress-controller
+
+# build nginx and publish docker images to quay.io.
+# this can take up to two hours.
+docker run --rm -it \
+  --volume $DIR/images/ingress-controller:/tf \
+  -w /tf \
+  -v ${AWS_FILE}:/root/aws.tfvars:ro \
+  -v ${ENV_FILE}:/root/env.tfvars:ro \
+  build-ingress-controller-terraform
+
+docker rmi -f build-ingress-controller-terraform