updated to allow deployment to be driven by a configuration file
diff --git a/roles/head-node/files/compute-node.yml.j2 b/roles/head-node/files/compute-node.yml.j2
new file mode 100644
index 0000000..4a6a50d
--- /dev/null
+++ b/roles/head-node/files/compute-node.yml.j2
@@ -0,0 +1,4 @@
+- hosts: all
+  remote_user: ubuntu
+  roles:
+    - {{ provision.role }}