docker : build the UI

[aldehir]

Overview

Fixes #24726 by building the UI separately.

Requirements

• I have read and agree with the contributing guidelines
• AI usage disclosure: Yes

[ngxson]

Publishing new images: https://github.com/ggml-org/llama.cpp/actions/runs/27828808113

[maikelthedev]

Thank you all involved

[ngxson]

seems like one of the build fails because the native module is not available on that platform: https://github.com/ggml-org/llama.cpp/actions/runs/27828808113/job/82360189883

for details: this is because some node modules use native code (usually in c++ / go / rust / etc), so the pre-built package should be available for that platform, which doesn't seem to be the case for s390x

[CISC]

for details: this is because some node modules use native code (usually in c++ / go / rust / etc), so the pre-built package should be available for that platform, which doesn't seem to be the case for s390x

A better solution is perhaps to build UI (once) before the Docker images and copy the artifact into each image?

[aldehir]

I thought about that but then it doesn't make the Dockerfiles stand-alone if one wanted to build them directly. Seems it's the only option. The s390x build was the only one I couldn't test in my own repo.

[ngxson]

another option is to disable lightningcss on the vite/svelte build, not I'm not 100% if that is a configurable option

[CISC]

I thought about that but then it doesn't make the Dockerfiles stand-alone if one wanted to build them directly. Seems it's the only option. The s390x build was the only one I couldn't test in my own repo.

Hm, true, let's leave the others as-is and do this for s390x. If the dist folder is missing when user is building it will try to download it like before.