Airgap improvement

[alexbasista]

Description

Adding functionality, most significantly to user_data and IAM, to enable pulling the TFE application container image from a custom registry location (including conditional logic to support Amazon Elastic Container Registry with instance profile credentials) in a scenario where the TFE environment has limited to no egress connectivity to the public internet. This previously was not supported, although the input variables existed with default values to the publicly hosted location (images.releases.hashicorp.com). So this would almost fall in between the categories of a bug fix and new feature.

Related issue

N/A

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)
• This change requires a documentation update

How has this been tested?

• Deployed TFE successfully using Docker as the container runtime
• Deployed TFE successfully using Podman as the container runtime
• Verified Terraform runs within a workspace executed successfully on both
• Tested upgrading to a new TFE version on both

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Additional notes

N/A

[jkellner-hashi]

This is a great addition 👍

[abuxton]

👍