Test removing dev libs from main Dockerfile now that it works on a runtime base image.

[johnwhumphreys]

Follow-up on this warning after the last Dockerfile update.

The base image was changed from 'cuda12.6-cudnn9-devel' to 'cuda12.6-cudnn9-runtime', but the Dockerfile still installs development packages (clang, protobuf-compiler) and development libraries (liblzma-dev, libunwind-dev, libibverbs-dev, librdmacm-dev). Runtime images typically lack the infrastructure needed for these development tools and libraries. Consider using the '-devel' variant if development tools are required, or remove the development packages if only runtime functionality is needed.