Ensure backup folder exists before writing post files (FileNotFoundError)

Problem

Workflow fails with the error:

FileNotFoundError: [Errno 2] No such file or directory: 'backup/11.md'

This occurs because the code in Gmeek.py attempts to write to the backup directory without first ensuring the directory exists, causing workflow failures during the "Generate new html" step.

Solution

Update Gmeek.py, in the addOnePostJson method, to add the following line before opening or writing backup files:

import os
os.makedirs(self.backup_dir, exist_ok=True)

This creates the backup folder if it does not already exist, preventing the FileNotFoundError.

Acceptance Criteria

• The workflow no longer fails with FileNotFoundError related to the backup directory.
• The Gmeek.py script creates the backup directory if missing.

Context

See failing job logs for details.