installing packages with spack in eic container fails

Whenever I try to install something with spack install --add inside the container, Spack attempts to build qt@5.15.12 and then fails during the configure phase.

```
$ docker run --rm -it eicweb/eic_cuda:25.08-stable

> spack env ls
==> No environments

> spack env status
==> In environment /opt/spack-environment/cuda

> spack install --add units
...
==> Installing qt-5.15.12-3asbnrc6c4z2h5h5asqvzm3ectbmaq6u [472/529]
==> No binary for qt-5.15.12-3asbnrc6c4z2h5h5asqvzm3ectbmaq6u found: installing from source
==> Applied patch ... (multiple qt5 patches)
==> Ran patch() for qt
==> qt: Executing phase: 'configure'
...
==> Error: ProcessError: Command exited with status 1
...
==> Warning: Skipping build of xxdiff-2023-01-10-... since qt-5.15.12-... failed
```