Executable `/usr/bin/ruby2.5` not found

[kenorb]

The following error happens on GitHub Actions. I believe Ruby is installed fine.

Check markdown files.....................................................Failed
- hook id: markdownlint
- exit code: 1

Executable `/usr/bin/ruby2.5` not found

Any clues? This was working before.

Config:

  - repo: https://github.com/jumanjihouse/pre-commit-hooks
    rev: master
    hooks:
      - id: markdownlint