Update Dockerfile

Dockerfile

@@ -1,14 +1,21 @@
 FROM python:3.9-slim-bookworm
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1 \
+    STREAMLIT_BROWSER_GATHER_USAGE_STATS=false
+
 WORKDIR /app
 
-# system deps (minimal)
+# system deps (keep minimal; drop build-essential if not building wheels)
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    build-essential curl git ca-certificates \
+    curl git ca-certificates \
  && rm -rf /var/lib/apt/lists/*
 
-# python deps
+# python deps (better cache behavior)
 COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+RUN python -m pip install --upgrade pip \
+ && pip install --no-cache-dir --prefer-binary -r requirements.txt
 
 # your code
 COPY . .
@@ -16,5 +23,8 @@ COPY . .
 ENV PORT=7860
 EXPOSE 7860
 
-# run your app.py
+# 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}"]