Hi, I'm trying to use Nix to build something inside a Docker container spawned by Jenkins. However, along the build, I get the following error:
```
error (ignored): cannot unlink '/tmp/nix-build-rust.drv-0/rust-nightly-x86_64-unknown-linux-gnu/rust-docs/share/doc/rust/html/core/u32': Directory not empty
error: cannot unlink '/tmp/nix-build-rust.drv-0/rust-nightly-x86_64-unknown-linux-gnu/rust-docs/share/doc/rust/html/book/img/ferris': Directory not empty
```
Does somebody know what the reason might be?