Terraform release (#4613)

* Add script to build the ingress controller image using terraform

* Update terraform to 0.12.9

build/images/ingress-controller/build-ingress-controller.sh

@@ -0,0 +1,93 @@
+#!/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.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+function source_tfvars() {
+  eval "$(
+    awk 'BEGIN {FS=OFS="="}
+    !/^(#| *$)/ && /^.+=.+$/ {
+      gsub(/^[ \t]+|[ \t]+$/, "", $1);
+      gsub(/\./, "_", $1);
+      gsub(/^[ \t]+|[ \t]+$/, "", $2);
+      if ($1 && $2) print $0
+    }' "$@"
+  )"
+}
+
+source_tfvars /tmp/env
+
+export DEBIAN_FRONTEND=noninteractive
+
+apt -q=3 update
+
+apt -q=3 dist-upgrade --yes
+
+add-apt-repository universe   --yes
+add-apt-repository multiverse --yes
+
+apt -q=3 update
+
+apt -q=3 install \
+  apt-transport-https \
+  ca-certificates \
+  curl \
+  make \
+  htop \
+  software-properties-common --yes
+
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+
+add-apt-repository \
+  "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
+  $(lsb_release -cs) \
+  stable" --yes
+
+apt -q=3 update
+
+apt -q=3 install docker-ce --yes
+
+echo ${docker_password} | docker login -u ${docker_username} --password-stdin quay.io
+
+curl -sL -o /usr/local/bin/gimme https://raw.githubusercontent.com/travis-ci/gimme/master/gimme
+chmod +x /usr/local/bin/gimme
+
+eval "$(gimme 1.13.1)"
+
+export GOPATH="/tmp/go"
+
+INGRESS_DIRECTORY="${GOPATH}/src/k8s.io"
+
+mkdir -p ${INGRESS_DIRECTORY}
+cd ${INGRESS_DIRECTORY}
+
+git clone https://github.com/kubernetes/ingress-nginx
+
+cd ingress-nginx
+
+make register-qemu
+
+echo "Building NGINX image..."
+make all-container
+
+echo "Publishing NGINX images..."
+make all-push
+
+# Requires https://github.com/kubernetes/ingress-nginx/pull/4271
+#echo "Creating multi-arch images..."
+#make push-manifest