[Bug] `Contexts.env` result misses the `env.` prefix

[Vampire]

Component

• [x] github-workflows-kt (library with the DSL)
• [ ] bindings server (https://bindings.krzeminski.it)
• [ ] I don't know

Action

val FOO by Contexts.env

and then using it

Expected

env.FOO is used

Actual

FOO is used

Version

3.4.0

[krzema12]

There are actually 3 things wrong here:

1. Contexts.env wasn't meant to be used with GitHub Actions env context, but instead as a type-safe way to refer to the env vars from shell. We don't have support for env context, and we probably should under Contexts.env. For type-safe referring from shell, we should have some other mechanism.
2. Even with the assumption that Contexts.env is for shell, the usage shown in the tests: https://github.com/typesafegithub/github-workflows-kt/blob/8005a2e446b7c80cabb68ea9022b3fb2d87ef973/.github/workflows/end-to-end-tests.main.kts#L75-L77 produces this:

   env:
     $GREETINGS: World
   

   - it should be without the dollar sign.
3. The tests don't have any assertion on the correct interpolation e.g. here: https://github.com/typesafegithub/github-workflows-kt/blob/8005a2e446b7c80cabb68ea9022b3fb2d87ef973/.github/workflows/end-to-end-tests.main.kts#L191

[Vampire]

Oh, yeah, that's quite confusing then right now.