✨ Do not install `dagger` CLI on runner if already present in `PATH` unless `version:` specified and different from installed version

[jpadams]

What are you trying to do?

If a GHA runner has dagger CLI pre-installed, the action does not need to install it and should not do so unless the user asks for a particular version like with version: "0.13.7" AND that requested version is different from the already-installed version.

Why is this important to you?

How are you currently working around this?

[jedevc]

We actually do this already in dagger/dagger: https://github.com/dagger/dagger/blob/9e0f6aa9eadc90da9f8646726ac4d3ce16b43b69/.github/actions/call/action.yml#L43-L60

We should just be able to grab this logic from there.

[gerhard]

LGTM!