No, it is more like terminating an EC2 instance. All data is lost.

If you have user data you'd like to retain, please request a database dump before destroying your deployment.

You can run FusionAuth in a docker container and spin it up using the docker install instructions in your CI/CD pipeline.

You may also be interested in using Kickstart, which lets you configure every aspect of FusionAuth (except adding multiple API keys) via a simple JSON file. This ensures your integration tests run against an auth system that has been configured exactly as you expect.

Yes. Apart from what is outlined in the system requirements, FusionAuth does not require any network connection to the Internet.

There is no official support for Heroku at this time. Follow along on this issue (and vote it up if this is important to you) if you'd like to know when such support happens.

However, there is a community supported project with a "Deploy to Heroku" button. This is provided and tested by a community member.