Uff, I had no idea that Postgres v15 introduced WAL_LOG and changed the defaults from FILE_COPY. For (parallel CI) test envs, it make so much sense to switch back to the FILE_COPY strategy ... and I previously actually relied on that behavior.
Oracle Cloud Infrastructure tries to fill exactly this sweet spot. Cheaper compute than the other hyperscalers, while still offering similar security features (TPM, Shielded Instances, Measured Boot) and a bare-metal-first focus.
Disclaimer, just joined Oracle a few months ago. I'm using both Hetzner and OCI for my private stuff and my open-source services right now. I still personally think they've identified a clever market fit there.
Raised an issue in my previous pet project for doing concurrent integration tests with real PostgreSQL DBs (https://github.com/allaboutapps/integresql) as well.