Location of `data_tls` is configured at compile time and not available with Nix
The location of data_lts
is configured at compile time.
see https://doc.rust-lang.org/std/macro.env.html
By default, it will be located under build/source/data_tls
, but in a Nix environment, this location is not available after the build.
It might be better to be able to configure at runtime the location of this folder
grpc-server --tls-data /my/path