Point SGLANG_BRANCH back to sglang-miles

[yueming-yuan]

sglang-miles has been repointed to the v0.5.15 stack (same commit as sglang-miles-v0.5.15, 5bca6f8). Restore the default branch reference before the transitional sglang-miles-v0.5.15 branch is deleted.

[gemini-code-assist]

Code Review

This pull request updates the SGLANG_BRANCH in the Dockerfile to use the sglang-miles branch. The reviewer noted that using a floating branch can negatively impact build reproducibility and suggested adding a comment to guide users to pin the SGLANG_COMMIT for stable, production-ready builds.

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[gemini-code-assist]

Using a floating branch like sglang-miles makes the Docker build non-reproducible. The version of sglang will depend on when the image is built, which can cause unexpected behavior for images tagged as latest or used in production. While this is acceptable for development builds, it's a risk for stable releases.

To improve reproducibility, I'd suggest adding a comment to guide users to pin the dependency using the SGLANG_COMMIT argument for stable builds.

# The sglang-miles branch is a development branch. For reproducible builds, set SGLANG_COMMIT to a specific commit hash.
ARG SGLANG_BRANCH=sglang-miles

[guapisolo]

Approved