Document custom hcl binary (such as opentofu) and version

[nitrocode]

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• I'd be willing to implement this feature (contributing guide)

Describe the user story

Allow an easy path for opentofu for early adopters

Describe the solution you'd like

Document how to use a custom terraform binary whether it's open tofu or hashicorp terraform

Document using native terraform without a wrapper like terragrunt/atmos/terramate

Document with a wrapper

Document how to download a custom version. This can on the same document if written generically.

Describe the drawbacks of your solution

Temporary workaround

Describe alternatives you've considered

N/A

References

• relates to user's manual opentofu steps in epic Support OpenTofu (epic) #3741 (comment)
• relates to Preinstall opentofu in containers #4337