Founder of Depot here. To my knowledge, we are the first engine to support different syntaxes in this compatible way via Depot CI [0]. Great time to try it out and let us know your thoughts! We’ve built a lot of cool stuff into it like parallel steps, custom images, and a full CLI/API interface so you can literally everything without going into the web app.

[0] https://depot.dev

We currently use external runners (Blacksmith.sh), but that didn't shield us from this as GitHub actions is still the control plane for triggering and monitoring them.

We're now considering Buildkite (apparently they have a GH actions migration tool) or self hosting something (GitLab CI, maybe even Jenkins), as it looks like that would've kept ticking over since we're still seeing webhooks being triggered today during the downtime.

github actions themselves can be self hosted, its quite nice actually to be able to keep your same patterns as cloud hosted actions and with one line change to the yaml have it running on your own hardware. I do this for actions that take 6-7 hours so I am not burning through the 3000 minutes that come free with my account.

there are a couple and have very good reputation - though I've never used them

https://www.blacksmith.sh/ and https://runs-on.com/

They also say that they're much cheaper than github