[nixbuild]

nixbuild.net ("Nix Builds as a Service") can run any Nix build with fs randomization similar to disorderfs:

https://blog.nixbuild.net/posts/2021-01-13-finding-non-deter...

It isn't enabled by default but can be turned on with a setting:

https://docs.nixbuild.net/settings/#inject-fs-randomness