it builds & runs, however fails with:

```
Running tests/simple.rs (target/debug/deps/simple-43fcfc5114379d5a)
/home/mhueschen/projects/social_sensemaker/target/debug/deps/simple-43fcfc5114379d5a: symbol lookup error: /nix/store/qjgj2642srlbr59wwdihnn66sw97ming-glibc-2.33-123/lib/libpthread.so.0: undefined symbol: __libc_siglongjmp, version GLIBC_PRIVATE
```

I believe sweettest does some sort of runtime provisioning of stuff, so
maybe that's why we have the issue at test-runtime, but we are able to
build things successfully...

run `cargo test` on both ubunto & macos.