However, having also used Buildkite, I'm not sure I could go back to GHA - it's slightly nicer to target, and at least as large a step towards reliability & predictability as Travis -> GHA was.
I use Buildkite all day as part of my job, and I have to say, it's amazing. The company is great to work with, the product is highly flexible for a variety of complex build workflows teams want to implement, and has scaled beautifully for 1000+ concurrent build machines split between on-prem and cloud. No affiliation, just a customer.
