title: Any way to trigger a CodeDeploy deployment with Terraform after changes in configuration?
body: <p>I am currently migrating my config management on AWS to Terraform to make it more pluggable. What I like is the possibility to manage rolling updates to an Autoscaling Group where Terraform waits until the new instances are in service before it destroys the old infrastructure.
  This works fine with the "bare" infrastructure. But I ran into a problem when update the actual app instances. 
  The code is deployed via AWS CodeDeploy and I can tell Terraform to use the generated name of the new Autoscaling Group as deployment target but it doesn't deploy the code to the new instances on startup. When I manually select "deploy changes to the deployment group" the deployment starts successfully.
  Any ideas how to automate this step?</p>