feat: support OpenTofu

[scottrigby]

Follow-up to question in #1016

This issue is more clearly scoped to track actual support for OpenTofu in weaveworks/tf-controller. Thanks @LappleApple for the heads up.

Problem/opportunity

Many people have been impacted by HashiCorp's decision to change Terraform's licensing. As a result, the OpenTofu (formerly Open TF) fork of Terraform was created to remain open source, community-driven, and managed by the Linux Foundation.

Given OpenTofu's broad appeal, and the strong value that weaveworks/tf-controller already brings to GitOps for Terraform, it would be even more valuable if this controller also supported OpenTofu.

Suggested approach

@matheuscscp – and anyone else interested – let's use this issue as an entry point for collaboration toward OpenTofu Support.

Given that the tf-controller maintainers are busy with Terraform for now, OpenTofu support in this controller should be community-driven. As Chanwit said in #1016 (comment):

We've been busy tackling all things Terraform, and it's certainly kept our hands full.
Regarding OpenTofu, your offer to contribute is much appreciated. Please feel free to get involved.

[shanduur]

Hi @paulcarlton-ww , @scottrigby ! I have seen some initial work in the tf-runner-images, are you still thinking about working on this issue?

[nab-gha]

I have reopened the PR, I closed because the Weaveworks project manager for TF controller asked me to, but recent developments at Weaveworks have removed this impediment.

[uya116]

Thank you @paulcarlton-ww , @shanduur , @scottrigby !
Does this mean that if we wait, we will be able to use OpenTofu with the TF controller without having to build our own runner image?

[uya116]

I have understood the situation.
#1166

[chanwit]

This project is now rebooted and landed to the new home, which is 100% community driven.
We're now prioritizing OpenTofu support so any contributions are welcome!

[kvendingoldo]

At this moment if you need to have a support of Terraform as well as OpenTofu (and Terragrunt :) ) in one tool you can use https://github.com/tofuutils/tenv which my team wrote some months ago. A lot of users switched to that tool to unify version management in the world of Terraform.

You're welcome to open any issues or contribute to tenv.

[ilithanos]

At this moment if you need to have a support of Terraform as well as OpenTofu (and Terragrunt :) ) in one tool you can use https://github.com/tofuutils/tenv which my team wrote some months ago. A lot of users switched to that tool to unify version management in the world of Terraform.

You're welcome to open any issues or contribute to tenv.

I have to ask you to stop spamming your project in our tickets, it's not that it's a bad project, bit it literally has nothing to do with the tickets you try to advertise for it in.

It will not work in combination with the way tofu controller handles terraform, and there are other solutions now to use openTofu with the tofu-controller.

I know you are just trying to get attention to your project and get more contributers and users. But this is the wrong way to go about it.