configure public subnet to map public ip on launch

[philvarner]

since the public subnet will be used most often for batch jobs

Related issue(s)

• n/a

Proposed Changes

1. modify the public subnet to auto-assign public IP addresses, so that they can be used in Batch. The main use case in a FilmDrop deployment for EC2 instances is as compute for Batch jobs. Putting these in the private subnet works, but incurs NAT Gateway costs for data transfer. Putting them in the public subnet does not incur these costs, but also doesn't work with Batch unless public IPs are assigned.

Testing

This change was validated by the following observations:

1. This change was made in the Earth Search deployment, and ECS-created EC2 instances were able to be used by Batch.

Checklist

• I have deployed and validated this change (as part of Earth Search Cirrus)
• Changelog
  • I have added my changes to the changelog
  • No changelog entry is necessary
• README migration
  • I have added any migration steps to the Readme
  • No migration is necessary

[philvarner]

closing, needs to be re-worked after recent changes