wrangler dev not allocating TTY to containers

### What versions & operating system are you using?

wrangler v4.28.1

### Please provide a link to a minimal reproduction

https://github.com/mckamyk/electric-wrangler

### Describe the Bug

The electric-sql docker image is an elixir project, and it is built such that it expects a tty. When running this container in `wrangler dev` the application crashes instantly with an error message that seems to indicate that it doesn't have a tty.

When running with the same Dockerfile standard `docker build .` and `docker run`, it runs just fine.

### Please provide any relevant error logs

The logs of the workerd spawn container are as follows:
```
=ERROR REPORT==== 7-Aug-2025::21:37:29.969922 ===
** State machine user_drv terminating
** When server state = {undefined,undefined}
** Reason for termination = error:undef
** Callback modules = [user_drv]
** Callback mode = state_functions
** Stacktrace =
** [{erlang,nif_error,[undef],[{error_info,#{module => erl_erts_errors}}]},
{prim_tty,isatty,1,[{file,"prim_tty.erl"},{line,1473}]},
{user_drv,init,1,[{file,"user_drv.erl"},{line,171}]},
{gen_statem,init_it,6,[{file,"gen_statem.erl"},{line,3323}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,333}]}]
```
Which LLMs point to this being an error about `isatty` not being present.

The logs produced by wrangler look like standard "cant connect to port" indicating that the container isn't live.