David Kimura PRO said 3 months ago on Kamal in GitHub Actions :
  Sigfrid I use the SSH Agent pack that will allow kamal to use it.

      - uses: webfactory/ssh-agent@v0.9.0
        with:
          ssh-private-key: ${{ secrets.SSH_PRIVATE_KEY }}

You may need to set up which ssh user in the deploy.yml

# Use a different ssh user than root
ssh:
  user: root