Update sync-main-to-dev.yaml

Author: ralfhandl

.github/workflows/sync-main-to-dev.yaml

@@ -31,6 +31,8 @@ jobs:
         id: pull_request
         shell: bash
         run: |
+          git config user.name ${GITHUB_ACTOR}
+          git config user.email "a@b.c"
           SYNC="$BASE-sync-with-$HEAD"
           git fetch origin $HEAD $BASE
           git checkout -b $SYNC origin/$SYNC || git checkout -b $SYNC origin/$BASE