Terraform release (#4613)

* Add script to build the ingress controller image using terraform

* Update terraform to 0.12.9

build/images/ingress-controller/versions.tf

@@ -0,0 +1,11 @@
+
+terraform {
+  required_version = ">= 0.12"
+
+  required_providers {
+    aws   = "~> 2.0"
+    tls   = "~> 2.0"
+    local = "~> 1.3"
+    null  = "~> 2.1"
+  }
+}