fix: use GITHUB_ACTOR in git config

Author: vil02

.github/workflows/update_directory_md.yml

@@ -50,8 +50,8 @@ jobs:
       - name: Update DIRECTORY.md
         run: |
           cat DIRECTORY.md
-          git config --global user.name github-actions
-          git config --global user.email '${GITHUB_ACTOR}@users.noreply.github.com'
+          git config --global user.name "$GITHUB_ACTOR"
+          git config --global user.email "$GITHUB_ACTOR@users.noreply.github.com"
           git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY
           git add DIRECTORY.md
           git commit -am "updating DIRECTORY.md" ||  true