Using Buildkite for scaling out and running parallel CI steps

Redpanda has implemented a process to enhance developer productivity by optimizing their continuous integration (CI) pipeline for parallel execution using Buildkite. By leveraging Buildkite's parallelism attribute and pre-command hook, alongside GitHub labels, developers can initiate parallel builds with ease, simply by adding a label such as "ci-repeat-X" to their pull requests. This workflow allows multiple instances of CI steps to run concurrently, reducing build times and enhancing stability. The process avoids clutter and manual steps by automatically managing the labels, ensuring a fast, simple, and productive experience. This approach reflects Redpanda's commitment to improving the efficiency of both their internal engineering team and external developers using their platform.