define provider for compute module

Author: sjpb

environments/skeleton/{{cookiecutter.environment}}/terraform/compute/main.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_version = ">= 0.14"
+  required_providers {
+    openstack = {
+      source = "terraform-provider-openstack/openstack"
+    }
+  }
+}