Update gen_md_files.yml

adds only a small improvement that only clones the current branch when running

Author: LizenzFass78851

.github/workflows/gen_md_files.yml

@@ -47,7 +47,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           git config --global --add safe.directory $GITHUB_WORKSPACE
-          git clone https://github-actions:$GITHUB_TOKEN@${GITHUB_SERVER_URL##*/}/$GITHUB_REPOSITORY.git $GITHUB_WORKSPACE --branch $GITHUB_REF_NAME
+          git clone https://github-actions:$GITHUB_TOKEN@${GITHUB_SERVER_URL##*/}/$GITHUB_REPOSITORY.git $GITHUB_WORKSPACE --branch $GITHUB_REF_NAME --single-branch
 
       - name: generate
         run: |