generate-app-token.js

const fs = require('fs')
const { createAppAuth } = require('@octokit/auth-app')

async function main() {
  const auth = createAppAuth({
    appId: 905201,
    privateKey: fs.readFileSync('/path/to/private-key.pem', 'utf8')
  });

  const appAuth = await auth({
    type: 'app',
  });

  console.log(appAuth.token)
}

main()