Though now GitHub supports so called "composite" actions, that declare intention to use shell scripts explicitly, they are not exposed to certain environment variables, strictly required to do some actions, like uploading artifacts: ACTIONS_RUNTIME_URL, ACTIONS_RUNTIME_TOKEN GITHUB_RUN_ID and maybe some other.
More info:
- https://github.com/DavidGOrtega/gh-runner/blob/48b040fa804be4a2f43abee064b365838f94055b/src/Runner.Worker/Handlers/ContainerActionHandler.cs#L178-L185
- https://github.com/actions/toolkit/blob/4f7fb6513a355689f69f0849edeb369a4dc81729/packages/artifact/__tests__/ci-test-action/index.js
So you have 2 options:
* either use a simple node wrapper to start the bash script. This repo is a template of an "Action" doing this.
* or use a node script fetching the needed vars and passing them. https://github.com/KOLANICH-GHActions/passthrough-restricted-actions-vars should help you with this.