fix: fix terragrunt non-interactive flag

[sidpalas]

Terragrunt redesigned their CLI (released in v0.77.22, see GH issue comment) to remove the terragrunt prefix.

This PR removes the --terragrunt-non-interactive for apply and destroy commands. This flag is not valid for newer versions of Terragrunt and was duplicative with ENV vars set here:

digger/libs/execution/terragrunt.go

Lines 123 to 125 in 53173e5

	env = append(env, "TERRAGRUNT_NON_INTERACTIVE=true")
	env = append(env, "TG_NO_COLOR=true")
	env = append(env, "TG_NON_INTERACTIVE=true")

By removing the CLI flag but setting both TERRAGRUNT_NON_INTERACTIVE=true AND TG_NON_INTERACTIVE=true, digger remains compatible with versions before and after the CLI redesign https://terragrunt.gruntwork.io/docs/migrate/cli-redesign/

---

🧠 AI Assistance Disclosure Policy

Important

Inspired by ghostty.
If you used any AI assistance while contributing to Digger, you must disclose it in this PR.

---

✅ AI Disclosure Checklist

• I understand that all AI assistance must be disclosed.
• I did not use AI tools in this contribution.
• I used AI tools and have disclosed details below.

Details (if applicable):

Example: Used ChatGPT to help with doc phrasing.
Example: Code generated by Copilot; reviewed and verified manually.

---

💡 Notes

• Trivial auto-completions (single words, short phrases) don’t need disclosure.
• Contributors must understand and take responsibility for any AI-assisted code.
• Failure to disclose is considered disrespectful to maintainers and may delay review.

[ZIJ]

Actually @sidpalas I just realised that this would be a breaking change for people who set terragrunt version explicitly to anything older than v0.77.2

Spoke with @motatoes and he suggested setting equivalent env vars (TG_NON_INTERACTIVE and older equivalent TERRAGRUNT_NON_INTERACTIVE) - this way we would not have to do a conditional check of the actual terragrunt version

[sidpalas]

Actually @sidpalas I just realised that this would be a breaking change for people who set terragrunt version explicitly to anything older than v0.77.2

Spoke with @motatoes and he suggested setting equivalent env vars (TG_NON_INTERACTIVE and older equivalent TERRAGRUNT_NON_INTERACTIVE) - this way we would not have to do a conditional check of the actual terragrunt version

Yeah that makes sense as a way to avoid the breaking change.

It would be nice to land #2287 before making that change to avoid triplicating the env vars...

Alternatively,

• the env var could be set that the job level (even though it is only needed at the step where digger is executed)
• the env var could be set within the go code

---

Actually that third option may be the best since it doesn't need to be configurable and doesn't need to be exposed to the end users of the action.

[motatoes]

Actually that third option may be the best since it doesn't need to be configurable and doesn't need to be exposed to the end users of the action.

@sidpalas yes that would be my preference indeed, setting it at the go code level, there is an envs map in the same function where we can set it so it is exposed directly to the terragrunt process, should be a 2-liner change!

[sidpalas]

Actually that third option may be the best since it doesn't need to be configurable and doesn't need to be exposed to the end users of the action.

@sidpalas yes that would be my preference indeed, setting it at the go code level, there is an envs map in the same function where we can set it so it is exposed directly to the terragrunt process, should be a 2-liner change!

Looks like they are already set!

https://github.com/sidpalas/digger/blob/sp/fix-terragrunt-flags/libs/execution/terragrunt.go#L122-L125

So we just need to remove the hardcoded cli flag

[motatoes]

@sidpalas oh nice, yeah its a 1 liner then haha

[sidpalas]

This is duplicative with ENV var set here:

digger/libs/execution/terragrunt.go

Lines 123 to 125 in 53173e5

	env = append(env, "TERRAGRUNT_NON_INTERACTIVE=true")
	env = append(env, "TG_NO_COLOR=true")
	env = append(env, "TG_NON_INTERACTIVE=true")

By removing the CLI flag but setting both TERRAGRUNT_NON_INTERACTIVE=true AND TG_NON_INTERACTIVE=true this remains compatible with versions before and after the CLI redesign https://terragrunt.gruntwork.io/docs/migrate/cli-redesign/

[sidpalas]

Updated to remove the CLI flag in favor of the environment variables (which were already being set)