[vllm] [cpu] [sagemaker] Fix image size baseline and add ulimit

- Set image_size_baseline to 5000 (actual image ~3.5GB)
- Add ulimit -c 0 to disable core dumps (matches upstream)

Author: timelfrink

vllm/buildspec-cpu-sm.yml

@@ -30,7 +30,7 @@ images:
     <<: *BUILD_REPOSITORY
     context:
       <<: *BUILD_CONTEXT
-    image_size_baseline: 15000
+    image_size_baseline: 5000
     device_type: &DEVICE_TYPE cpu
     python_version: &DOCKER_PYTHON_VERSION py3
     tag_python_version: &TAG_PYTHON_VERSION py312

vllm/x86_64/cpu/Dockerfile.cpu

@@ -63,6 +63,8 @@ ENV UV_HTTP_TIMEOUT=500
 # Memory allocator + Intel OpenMP for x86_64 performance
 ENV LD_PRELOAD="/usr/lib/x86_64-linux-gnu/libtcmalloc_minimal.so.4:/opt/venv/lib/libiomp5.so"
 
+RUN echo 'ulimit -c 0' >> ~/.bashrc
+
 # ====================== vllm-build =========================================
 FROM base AS vllm-build