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doc: Explain differencs in CWD when run in a composite action #368

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17 changes: 17 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -322,6 +322,23 @@ Additionally, you'll want to use the [checkout
action](https://github.com/actions/checkout) to make sure your script file is
available.

### Running in Composite Actions

When used from a composite-action the current working directory is the invoking workflow,
*not* the composite action's. Be sure to use an absolute path to any of the action's
resources in this case like so:

```yaml
name: My Composite Action Using Github Scripts
runs:
using: "composite"
steps:
- uses: actions/github-script@v6
script: |
const script = require(process.env.GITHUB_ACTION_PATH + '/my-action-main.js')
console.log(script({context, core})
```

### Run a separate file with an async function

You can also use async functions in this manner, as long as you `await` it in
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