fix: update tf module dir, add unstable deb key

terraform/module/variables.tf

@@ -0,0 +1,14 @@
+variable "project" {
+  description = "Google Cloud project to host resources in"
+  type        = string
+}
+
+variable "domain" {
+  description = "DNS name to serve static content"
+  type        = string
+}
+
+variable "dns_zone" {
+  description = "Cloud DNS zone to use"
+  type        = string
+}