Add CodeReviewGPT

[ofalvai]

Context

Demo cool stuff for the One More Thing conference attendees 👀

Changes

• Add the CodeReviewGPT step to the PR pipeline
• It runs in the first stage, parallel to the build-for-testing workflow (let's parallelize what we can)

Decisions

• GitHub token is properly scoped to this repo and to writing PR comments.
• Using gpt-4o as the LLM because it's a good balance between performance and price.

[bitrise-coresteps-bot]

CodeReviewGPT had a look at this PR and has the following comments:

1. How will the integration of CodeReviewGPT affect the overall CI/CD pipeline performance? Have you done any benchmarks or tests to ensure it won't significantly slow down other processes?

2. Are there adequate safeguards and fallbacks in place if CodeReviewGPT fails or experiences an outage? How will it impact the PR pipeline in such scenarios?

3. Have you verified the GitHub token's scope thoroughly to ensure it doesn't have permissions beyond what is necessary for its functionality? Security is crucial when handling tokens.

4. Is there a plan for regularly updating and maintaining the gpt-4o model to keep it aligned with the latest improvements and security patches?

5. Have you considered how feedback will be collected and acted on from the CodeReviewGPT comments? Will there be a specific process or owner responsible for reviewing the feedback given by the LLM?

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These questions are generated by a large language model. Please note that the model doesn't have a deep understanding of this codebase and the questions are not always relevant. Please use your best judgement when answering or ignoring these questions. This notice was also written by a large language model :)