A composite action lives at '.github/actions/setup-build-tools' in the same repository as the workflow. Which uses: value references it?
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Short Explanation and Infographic
Local actions use a relative path with './' pointing at the directory that contains action.yml.
Full explanation below image
Full Explanation
Same-repo actions are referenced with uses: ./path/to/action-dir where the directory includes action.yml. This is common for org-standard setup composites. local:// and github:// schemes shown are not the standard pattern. You still need checkout before the local action can be loaded if the workspace is empty—typically actions/checkout runs first. For publishing to other repos, move the action to its own repo and reference owner/name@ref.