using jinja style args

playbooks/edx_provision_test.yml

@@ -8,6 +8,7 @@
     security_group: sandbox
     image: ami-d0f89fb9
     region: us-east-1
+    instance_tags: '{"disposable": "true"}'
   roles:
     - launch_instance
 

playbooks/roles/launch_instance/tasks/main.yml

@@ -8,13 +8,13 @@
 - name: Launch instance 
   local_action: 
     module: ec2 
-    keypair: $keypair 
-    group: $security_group 
-    instance_type: $instance_type
-    image: $image 
+    keypair: "{{keypair}}"
+    group: "{{security_group}}"
+    instance_type: "{{instance_type}}"
+    image: "{{image}}"
     wait: true 
-    region: $region
-    instance_tags: $instance_tags
+    region: "{{region}}"
+    instance_tags: "{{instance_tags}}"
   register: ec2
  
 - name: Wait for SSH to come up