Reference subaction using absolute path

action.yml

@@ -28,7 +28,7 @@ runs:
         ref: ${{ inputs.main-branch }}
         fetch-depth: 0 # checkout a non-shallow copy so the generator can generate docs for all major versions
     - name: Generate static site
-      uses: ./.github/actions/docgen
+      uses: ${{ github.action_repository }}/.github/actions/docgen@${{ github.action_ref }}
       with:
         site-url: ${{ steps.configure-pages.outputs.base_url }}
         github-url: ${{ inputs.github-url }}