Build process turns hardlinks into symlinks

On Ubuntu, the rust-coreutils multi-call binary (similar to busybox) uses hardlinks for each of the utilities. It also uses an [Ubuntu-specific patch](https://github.com/uutils/coreutils/issues/10135) that requires `/proc/self/exe` to point to a file with the same name as `argv[0]`.

When using `nitro-cli build-enclave` to convert a container with this package installed, the hardlinks get converted into symlinks. This then results in the coreutils binaries not working at all:

```
root@(none):~# ls -la /usr/bin/mkdir
Security violation: Requested utility `ls` does not match executable name:
/usr/bin/coreutils
root@(none):~# /bin/busybox ls -la /usr/bin/mkdir
lrwxrwxrwx 1 root root 32 Sep 26 18:16 /usr/bin/mkdir -> ../lib/cargo/bin/coreutils/mkdir
root@(none):~# /bin/busybox ls -la /usr/bin/../lib/cargo/bin/coreutils/mkdir
lrwxrwxrwx 1 root root 25 Oct 22 10:39 /usr/bin/../lib/cargo/bin/coreutils/mkdir -> ../../../../bin/coreutils
```

Start at the nitro-cli build-enclave path and reproduce the conversion with a container containing rust-coreutils hardlinks. Trace how the container filesystem is assembled, then verify that the utility links remain hardlinks and that the resulting coreutils commands work inside the enclave.

Written by the indexing model from the issue text.