Branch preview environments

[mwarkentin]

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Tell us about your request It would be great if App Runner supported per-branch or per-PR preview environments for an application (similar to what Amplify Console or Heroku Review Apps offer). This would make it easy for developers to have a public endpoint to test and share changes that they're working on.

Support for #9 would help to do this in a seamless way and keep costs under control if there are many branches being worked on.

Describe alternatives you've considered N/A

Additional context N/A

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