[mysteria]

Hetzner also has the interesting choice of consumer-grade machines which probably work fine in cases where you are constrained by CPU power rather than memory capacity/bandwidth. You'll also lose a bit of redundancy and reliability but that might not be as big of a deal since the machines are managed by them and you can probably get things replaced quickly. For example depending on the workload the CCX43s might be replaceable by the AX52.

Meanwhile for CI runners you probably could split the big bare metal servers down into smaller individual machines and run less jobs of them. Depending on the CI load profile it might also make even more sense to scale out to the cloud on high demand as opposed to having a bunch of mostly idle machines.