Add co-author

Author: murrant

.github/workflows/auto-format.yml

@@ -83,5 +83,7 @@ jobs:
           git config --local user.email "github-actions[bot]@users.noreply.github.com"
           git config --local user.name "github-actions[bot]"
           git add -A
-          git commit -m "style: auto-format code [skip ci]"
+          CO_AUTHOR_NAME="${{ github.event.repository.owner.login }}"
+          CO_AUTHOR_EMAIL="${{ github.event.repository.owner.id }}+${{ github.event.repository.owner.login }}@users.noreply.github.com"
+          git commit -m $'style: auto-format code [skip ci]\n\nCo-authored-by: '"$CO_AUTHOR_NAME"' <'"$CO_AUTHOR_EMAIL"'>'
           git push