The runner.environment context is shown as invalid in this extension.

[vbem]

Describe the bug
When we use the runner.environment context listed in official document, this extension reports "Context access might be invalid".

To Reproduce
Steps to reproduce the behavior:

1. With this workflow '...'

steps:
  - if: ${{ runner.environment == 'github-hosted' }}
    run: echo "This is a ${{ runner.environment }} runner"

2. Do this '...'

Open the "Problems" Panel.

3. See error\

Context access might be invalid: environment

Expected behavior
The runner.environment context listed in official document can be recognized well by this extension.

Screenshots

Extension Version
v0.27.0

Additional context
Add any other context about the problem here.

[muzimuzhi]

Duplicate of actions/languageservices#78 which may be closed by merging of actions/languageservices#79.