[fastpages] Saving notebooks as Jekyll html files (BOOL_SAVE_MARKDOWN)

Hi,

I am currently trying to save the generated html versions of the uploaded notebooks and are trying to follow the README docs by inserting the following into the ci.yaml file in .github/workflows:

- name: convert notebooks and word docs to posts
      uses: ./_action_files
      with:
       BOOL_SAVE_MARKDOWN: true
       SSH_DEPLOY_KEY: ${{ secrets.SSH_DEPLOY_KEY }}

But I keep getting the following error:

converting: _notebooks/2021-11-13-03_Basic_Statistics.ipynb
converting: _notebooks/2020-02-20-test.ipynb
Identity added: _mykey (_mykey)
Warning: Permanently added 'github.com,140.82.112.4' (RSA) to the list of known hosts.
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

It is in the following repo: GitHub - MikkelMathiasen23/GameOfThrones_Network

Any help are much appreciated.