I'm working towards having an Ansible playbook to automatically set up AWS EC2 instances, an RDS database and deploy a Rails app to the EC2 instances.

I have managed to do the following:

1. set up an Ansible playbook to spin up multiple EC2 instances and an RDS instance.
2. set up an Ansible playbook to deploy a Rails app to EC2 using Ansible groups

Currently I still need to manually update the inventory file for step #2 based on the IP addresses that AWS provided after step #1.

How can I combine the 2 playbooks into 1 by automatically using the IP addresses given by AWS in the inventory file?