it's gotta be Unikraft Cloud unikraft.com
UnikraftUnikraft - The Infrastructure Platform for Building 10ms SandboxesThe millisecond compute layer used for sandboxes, headless browsers, CI/builds, functions / Agents / Databases and much more. Instant boot, VM-grade isolation, and millisecond scale-to-zero, so you can ship with superior economics. Deploy on-prem, BYOC or on dedicated hosts — you own the entire stack.