* feature: Add support for github action variables
* add --var flag for github variables
* unitests: Updated unittests to cover vars context.
* Remove syntax extension for vars and correct unit tests
* Update pkg/runner/expression.go
Co-authored-by: ChristopherHX <[email protected]>
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Co-authored-by: kuanyong-wong-partior <[email protected]>
Co-authored-by: ChristopherHX <[email protected]>
