🐛 Bug: branch-ruleset API crashes if a ruleset already exists (transition mode)

[JoshuaKGoldberg]

Bug Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Expected

Running npx create-typescript-app@beta with a config/preset that includes blockRepositoryBranchRuleset should pass on --mode transition.

Actual

If the ruleset already exists, the currently used API crashes:

◓  Running create-typescript-appError in request branch-ruleset RequestError [HttpError]: Validation Failed: "Name must be unique" - https://docs.github.com/rest/repos/rules#create-a-repository-ruleset
    at fetchWrapper (file:///Users/josh/repos/bingo/node_modules/.pnpm/@[email protected]/node_modules/@octokit/request/dist-bundle/index.js:122:11)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async requestWithGraphqlErrorHandling (file:///Users/josh/repos/bingo/node_modules/.pnpm/@[email protected]_@[email protected]/node_modules/@octokit/plugin-retry/dist-bundle/index.js:36:20)
    at async Job.doExecute (/Users/josh/repos/bingo/node_modules/.pnpm/[email protected]/node_modules/bottleneck/light.js:405:18) {
  status: 422,
  request: {
    method: 'POST',
    url: 'https://api.github.com/repos/JoshuaKGoldberg/my-typescript-app/rulesets',
    headers: {
      accept: 'application/vnd.github.v3+json',
      'user-agent': 'octokit.js/0.0.0-development octokit-core.js/6.1.4 Node.js/22',
      authorization: 'token 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\n',
      'content-type': 'application/json; charset=utf-8'
    },
    body: [Object: null prototype] {
      bypass_actors: [Array],
      conditions: [Object],
      enforcement: 'active',
      name: 'Branch protection for main',
      rules: [Array],
      target: 'branch'
    },
    request: {
      fetch: [Function: fetch],
      hook: [Function: bound bound register]
    }
  },
  response: {
    url: 'https://api.github.com/repos/JoshuaKGoldberg/my-typescript-app/rulesets',
    status: 422,
    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',
      'content-length': '170',
      'content-security-policy': "default-src 'none'",
      'content-type': 'application/json; charset=utf-8',
      date: 'Tue, 04 Mar 2025 14:58:46 GMT',
      'referrer-policy': 'origin-when-cross-origin, strict-origin-when-cross-origin',
      server: 'github.com',
      'strict-transport-security': 'max-age=31536000; includeSubdomains; preload',
      vary: 'Accept-Encoding, Accept, X-Requested-With',
      'x-accepted-oauth-scopes': '',
      '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': 'F8AA:76702:CBBC1D:19952E7:67C71526',
      'x-oauth-client-id': '178c6fc778ccc68e1d6a',
      'x-oauth-scopes': 'gist, read:org, repo, workflow',
      'x-ratelimit-limit': '5000',
      'x-ratelimit-remaining': '4921',
      'x-ratelimit-reset': '1741101493',
      'x-ratelimit-resource': 'core',
      'x-ratelimit-used': '79',
      'x-xss-protection': '0'
    },
    data: {
      message: 'Validation Failed',
      errors: [Array],
      documentation_url: 'https://docs.github.com/rest/repos/rules#create-a-repository-ruleset',
      status: '422'
    }
  }
}
◇  Ran create-typescript-app
│
└  Done. Enjoy your updated repository! 💝

Additional Info

Per https://docs.github.com/en/rest/repos/rules?apiVersion=2022-11-28#update-a-repository-ruleset, it looks like there's an update endpoint too.

🎁