Fix Binary Compilation

[scrogson]

This PR picks up from where #256 left off and adds some tests and tweaks the workspace configuration.

@evnu do the changes to the workspaces make sense?

[evnu]

@scrogson I think you forgot to add the new crate? :)

[scrogson]

I think you forgot to add the new crate? :)

I messed up the .gitignore

[evnu]

@scrogson were you able to reproduce the error from #256 with the new crate? I still don't understand completely how the error is triggered. We use [[bin]] as well in our crates, but did not see any such error yet.

[scrogson]

were you able to reproduce the error from #256 with the new crate?

Yes. If you remove the first commit and try running this with the changes I've made, you should see the error.

We use [[bin]] as well in our crates, but did not see any such error yet.

It looks like if there is a [lib] section in the Cargo.toml the mix task skips the [[bin]] section entirely (might be nice to support both compiling libs and bins in the same crate). I noticed that when I added the [[bin]] section to the rustler_test crate, the binary was compiled, but, it wasn't moved into the priv/native dir.

[evnu]

This looks good then!