Update Dockerfile

Dockerfile

@@ -1,7 +1,9 @@
 FROM python:3.9-slim AS builder
 
 WORKDIR /build
-COPY requirements.txt .
+
+# Copy all necessary files to builder stage
+COPY . .
 RUN pip install --no-cache-dir -r requirements.txt
 
 FROM python:3.9-slim
@@ -11,11 +13,11 @@ WORKDIR /app
 # Copy Python packages from builder
 COPY --from=builder /usr/local/lib/python3.9/site-packages /usr/local/lib/python3.9/site-packages
 
-# Copy application files
-COPY app.py .
-COPY difydev.py .
-COPY requirements.txt .
-COPY templates templates/
+# Copy application files from builder stage
+COPY --from=builder /build/app.py .
+COPY --from=builder /build/difydev.py .
+COPY --from=builder /build/requirements.txt .
+COPY --from=builder /build/templates templates/
 
 # Create necessary directories
 RUN mkdir -p /app/instance/sessions && \