Create new setup-cdktf action (was feature request: `install-only` mode)

[martimors]

Description

Not everyone has a deployment pipeline that is glued to GitHub Actions. For use-cases where cdktf-cli is used in other ways, it could be nice to have an action that just installs the cli (locally in the repo and using a cached lockfile) and allowing later commands to invoke it with npx.

Today, the alternative to this is to check in a package.json and lockfile in the repo, and this is a bit strange for people who don't use node otherwise.

References

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[xiehan]

This is an interesting idea and actually a use case we've run into ourselves in some of our example projects. The only thing I'm wondering about is whether this feature feels "at home" inside this action or if this would be better served as its own independent action -- I'm thinking setup-cdktf in the same vein as setup-node, setup-terraform, etc. That way we can keep the lists of configuration options, usage examples and any other documentation separate.

I'll need to discuss with the team to see what they think -- I suspect everyone will be generally on board with the idea, but I don't think we'll have time until next quarter at the earliest.