Add transformers package installation in Dockerfile.ci to ensure compatibility with the CI environment.

Signed-off-by: tzhouam <tzhouam@connect.ust.hk>

docker/Dockerfile.ci

@@ -43,6 +43,8 @@ print(f'vllm={vllm.__version__}'); \
 print(f'cuda={torch.version.cuda}'); \
 "
 
+RUN uv pip install transformers==4.57.6
+
 RUN ln -sf /usr/bin/python3 /usr/bin/python
 
 ENTRYPOINT []