Update Dockerfile

Dockerfile

@@ -1,21 +1,36 @@
 FROM python:3.9-slim
 
+# Optional: speed up pip & keep image small
+ENV PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1 \
+    STREAMLIT_BROWSER_GATHER_USAGE_STATS=false
+
 WORKDIR /app
 
-RUN apt-get update && apt-get install -y \
+# Minimal, Debian-safe packages (no software-properties-common on Debian)
+RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential \
     curl \
-    software-properties-common \
-    git \
-    && rm -rf /var/lib/apt/lists/*
+    ca-certificates \
+ && rm -rf /var/lib/apt/lists/*
+
+# If you use OpenCV or video/image I/O at runtime, uncomment these:
+# RUN apt-get update && apt-get install -y --no-install-recommends \
+#     ffmpeg libsm6 libxext6 libgl1 \
+#  && rm -rf /var/lib/apt/lists/*
 
+# Install deps first for better Docker layer caching
 COPY requirements.txt ./
-COPY src/ ./src/
+RUN pip install -r requirements.txt
 
-RUN pip3 install -r requirements.txt
+# App code
+COPY src/ ./src/
 
+# Expose is informational; HF Spaces sets $PORT
 EXPOSE 8501
 
-HEALTHCHECK CMD curl --fail http://localhost:8501/_stcore/health
+# Streamlit health endpoint (optional on HF; keep curl installed)
+HEALTHCHECK CMD curl --fail http://localhost:${PORT:-8501}/_stcore/health || exit 1
 
-ENTRYPOINT ["streamlit", "run", "src/streamlit_app.py", "--server.port=8501", "--server.address=0.0.0.0"]
+# Use a shell form so $PORT expands correctly on HF Spaces
+CMD ["bash", "-lc", "streamlit run src/streamlit_app.py --server.port=${PORT:-8501} --server.address=0.0.0.0"]