Readthedocs preview action throws RequestError[HttpError] when executed from a fork

[agoscinski]

Temporary fix is to just create a temporary PR with the same commits in this repo like I did in #57

Error message in https://github.com/lab-cosmo/equisolve/actions/runs/5603075530/jobs/10249186163

Run actions/github-script@v6
RequestError [HttpError]: Resource not accessible by integration
    at /home/runner/work/_actions/actions/github-script/v6/dist/index.js:6842:21
Error: Unhandled error: HttpError: Resource not accessible by integration
    at processTicksAndRejections (node:internal/process/task_queues:96:5) {
  status: 403,
  response: {
    url: 'https://api.github.com/repos/lab-cosmo/equisolve/pulls/55',
    status: 403,
    headers: {
      'access-control-allow-origin': '*',
      'access-control-expose-headers': 'ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset',
      connection: 'close',
      'content-encoding': 'gzip',
      'content-security-policy': "default-src 'none'",
      'content-type': 'application/json; charset=utf-8',
      date: 'Wed, 19 Jul 2023 19:08:58 GMT',
      'referrer-policy': 'origin-when-cross-origin, strict-origin-when-cross-origin',
      server: 'GitHub.com',
      'strict-transport-security': 'max-age=31536000; includeSubdomains; preload',
      'transfer-encoding': 'chunked',
      vary: 'Accept-Encoding, Accept, X-Requested-With',
      'x-content-type-options': 'nosniff',
      'x-frame-options': 'deny',
      'x-github-api-version-selected': '2022-11-28',
      'x-github-media-type': 'github.v3; format=json',
      'x-github-request-id': '2481:45F5:1C37CC0:3944F6A:64B834CA',
      'x-ratelimit-limit': '1000',
      'x-ratelimit-remaining': '998',
      'x-ratelimit-reset': '1689797338',
      'x-ratelimit-resource': 'core',
      'x-ratelimit-used': '2',
      'x-xss-protection': '0'
    },
    data: {
      message: 'Resource not accessible by integration',
      documentation_url: 'https://docs.github.com/rest/pulls/pulls#update-a-pull-request'
    }
  },
  request: {
    method: 'PATCH',
    url: 'https://api.github.com/repos/lab-cosmo/equisolve/pulls/55',
    headers: {
      accept: 'application/vnd.github.v3+json',
      'user-agent': 'actions/github-script octokit-core.js/3.6.0 Node.js/16.16.0 (linux; x64)',
      authorization: 'token [REDACTED]',
      'content-type': 'application/json; charset=utf-8'
    },
    body: '{"body":"\\r\\n\\r\\n<!-- readthedocs-preview equisolve start -->\\r\\n----\\n:books: Documentation preview :books:: https://equisolve--55.org.readthedocs.build/en/55/\\n\\r\\n<!-- readthedocs-preview equisolve end -->"}',
    request: { agent: [Agent], hook: [Function: bound bound register] }
  }
}