Allow action to work at airtight runners

[Hi-Fi]

Description

Currently action wants to always download Terraform (https://github.com/hashicorp/terraform-cdk-action/blob/main/src/action.ts#L79) as a blocking operation, and would fail if download is not possible.

We have Github Enterprise Server with self-hosted, mostly airtight runners that have tools pre-installed and packages available through internal repositories.

Event there wouldn't be airtight runners, downloading Terraform every time would not probably be desired option but "force" the used version and including it in the runner itself.

I see kind of 2 options how this could be done with small changes:

• boolean value to disable download fully. Version info doesn't matter here
• check if Terraform is installed already (and it's version). If that matches the configured one use it silently.

Third option would be to allow giving download host/URI (before package name/version) so that internal repository could be used as a source.

References

No response

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