WIP: Switch to S3 terraform backend

[Alex-Welsh]

This change is a work in progress. Please do not merge it before it's ready. We could end up with a horrible mess if we have competing state files.

Recent changes to the free tier of terraform cloud mean we can't use it anymore. Switching to an S3-compatible object store instead.

TODO:

• Ensure locking works
• Ensure old statefile is removed so we atomically switch
• Apply same change to other repos (e.g. terraform-bastion)
• Switch to tofu

[gemini-code-assist]

Code Review

This pull request updates the GitHub provider to version 6.11.1 and migrates the Terraform state backend from Terraform Cloud to a Cloudflare R2 S3-compatible storage. Review feedback suggests correcting the indentation of the backend configuration and adding a required_version constraint to ensure compatibility with the use_lockfile feature, which is only available in recent versions of Terraform and OpenTofu.

[stackhpc-ci]

Terraform Format and Style 🖌success

Terraform Initialization ⚙️success

Terraform Validation 🤖success

Validation Output

Warning: Deprecated attribute

  on repositories.tf line 20, in resource "github_repository" "repositories":
  20:       has_downloads,

The attribute "has_downloads" is deprecated. Refer to the provider
documentation for details.
Success! The configuration is valid, but there were some validation warnings
as shown above.

Terraform Plan 📖success

Show Plan

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Pusher: @Alex-Welsh, Action: pull_request, Working Directory: ``, Workflow: Terraform GitHub