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 to use this action or anything like this;
* or use a simple node wrapper to start the bash script. There is a template (https://github.com/KOLANICH-GHActions/node_based_cmd_action_template) of an "Action" doing this.
The code of this action was derived from https://github.com/actions/toolkit/blob/4f7fb6513a355689f69f0849edeb369a4dc81729/packages/artifact/__tests__/ci-test-action/index.js