[Feature] Set CHECKOUT_URL and CHECKOUT_REF

[aminya]

It would be nice if the action sets some environment variables about the repository and branch that is checking out. In particular, CHECKOUT_URL and CHECKOUT_REF are the two ones that I am interested in. I need to know these for some other operations.

[ericsciple]

Does GITHUB_REF and GITHUB_REPOSITORY help?

Here is a list, but I often run printenv|sort since sometimes the docs lag behind.

[aminya]

Those specify the repository and branch that trigger the action. But a user can decide to check out a completely different repository or branch based on the docs:
https://github.com/actions/checkout#usage

That is why I want to know the branch they have checked out.

[ericsciple]

Have you considered using the git command? For example, something like this to get the current branch: git rev-parse --symbolic-full-name HEAD

[andrewalc]

having some sort of output or env for this would be incredibly convenient and save an extra step