We can run a Forgejo instance for you with Firecracker VM runners on bare metal. We can also support it and provide an SLA. We're running it internally and it is very solid. We're running the runners on bare metal, with a whole lot of large CI/CD jobs (mostly Rust compilation).
The down side is that the starting price is kinda high, so the math probably only works out if you also have a number of other workloads to run on the same cluster. Or if you need to run a really huge Forgejo server!
I suspect my comment history will provide the best details and overview of what we do. We'll be offering the Firecracker runner back to the Forgejo community very soon in any case.