Update Dockerfile

Dockerfile

@@ -4,8 +4,11 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
     PIP_NO_CACHE_DIR=1 \
     STREAMLIT_BROWSER_GATHER_USAGE_STATS=false \
-    # 🔧 ensure Streamlit writes under /app, not /
-    HOME=/app
+    HOME=/app \
+    # where your app will save uploaded files
+    UPLOAD_DIR=/app/uploads \
+    # ensure temp files (e.g., file_uploader buffers) are writable
+    TMPDIR=/app/tmp
 
 WORKDIR /app
 
@@ -22,13 +25,16 @@ RUN pip install --upgrade pip \
 # App source
 COPY src/ ./src/
 
-# 🔧 Make Streamlit config dir writable
-RUN mkdir -p /app/.streamlit
+# Create writable dirs for Streamlit & uploads
+RUN mkdir -p /app/.streamlit /app/uploads /app/tmp
 
 # (Optional) run as non-root for security
 # RUN useradd -m -d /app appuser && chown -R appuser:appuser /app
 # USER appuser
 
+# Persist uploads across restarts (host can mount this)
+VOLUME ["/app/uploads"]
+
 EXPOSE 8501
 
 # Healthcheck