How to push to github with custom commit message with npm scripts?

In my package.json I have this

  "scripts": {
    "start": "gulp serve",
    "git": "git add . && git commit -m 'some-message' && git push --all"
  },

In the terminal I run npm run git and the changes are pushed. But how can I change the commit message on the fly? For example npm run git MESSAGE='another commit'

via relidon