Update Dockerfile

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9-slim-bookworm
+FROM python:3.11-slim-bookworm
 
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
@@ -7,24 +7,31 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
 
 WORKDIR /app
 
-# system deps (keep minimal; drop build-essential if not building wheels)
 RUN apt-get update && apt-get install -y --no-install-recommends \
     curl git ca-certificates \
  && rm -rf /var/lib/apt/lists/*
 
-# python deps (better cache behavior)
+# Install deps
 COPY requirements.txt .
 RUN python -m pip install --upgrade pip \
- && pip install --no-cache-dir --prefer-binary -r requirements.txt
-
-# your code
+ && pip install --no-cache-dir --prefer-binary -r requirements.txt \
+ # sanity check: ensure the function exists so the build fails early
+ && python - <<'PY'
+import sys, vix_utils
+print("python:", sys.version)
+print("vix_utils path:", vix_utils.__file__)
+print("vix_utils version:", getattr(vix_utils, "__version__", "unknown"))
+assert hasattr(vix_utils, "async_load_vix_term_structure"), \
+       "vix_utils missing async_load_vix_term_structure"
+PY
+
+# app code
 COPY . .
 
 ENV PORT=7860
 EXPOSE 7860
 
-# healthcheck helps detect boot issues
 HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
   CMD curl --fail http://127.0.0.1:${PORT}/_stcore/health || exit 1
 
-CMD ["sh", "-c", "streamlit run app.py --server.address=0.0.0.0 --server.port=${PORT}"]
+CMD ["sh", "-c", "streamlit run app.py --server.address=0.0.0.0 --server.port=${PORT}"]