ci(sglang): use dedicated-buildkit input instead of hardcoded endpoints

Align build.yml with main's dedicated-buildkit boolean input from PR #132
and pass dedicated-buildkit: true in sglang.yml.

Author: abatilo

.github/workflows/sglang.yml

@@ -24,6 +24,7 @@ jobs:
     with:
       image-name: sglang
       folder: sglang
+      dedicated-buildkit: true
       tag-suffix: ${{ inputs.tag || 'nccl-cuda12.9.1-ubuntu22.04-nccl2.29.2-1-torch2.10.0-vision0.25.0-audio2.10.0-abi1' }}
       build-args: |
         BASE_IMAGE=${{ inputs.base-image || 'ghcr.io/coreweave/ml-containers/torch:17ad6db-nccl-cuda12.9.1-ubuntu22.04-nccl2.29.2-1-torch2.10.0-vision0.25.0-audio2.10.0-abi1'}}