autobuild: add working-directory input

[cklin]

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.
• Confirm the changelog has been updated if necessary.

[cklin]

@igfoo Do you have any thoughts on how we should test this functionality?

[aeisenberg]

Looks like a spurious failure.

[aeisenberg]

Best way to test this would be to generate a small test project that uses the autobuild action. Create a workflow that runs codeql on that project and make sure to specify a working directory input. Perhaps something similar to the checkout_path tests.

[igfoo]

I've given it a try, and it looks like it works for me; thanks!

[aeisenberg]

nice

[cklin]

Finally got PR Check - Autobuild working directory to work:

• Check passing with working-directory input: https://github.com/github/codeql-action/actions/runs/2117821927
• Check failing without working-directory input: https://github.com/github/codeql-action/actions/runs/2117807488