Fix Dockerfile for CI/CD builds

Dockerfile

@@ -1,5 +1,5 @@
 # Multi-stage build for minimal image size
-FROM python:3.11-slim as builder
+FROM python:3.11-slim AS builder
 
 WORKDIR /app
 
@@ -13,23 +13,25 @@ COPY requirements.txt .
 RUN pip install --no-cache-dir --user -r requirements.txt
 
 # Runtime stage
-FROM python:3.11-slim
+FROM python:3.11-slim AS runtime
 
 WORKDIR /app
 
 # Copy installed packages from builder
 COPY --from=builder /root/.local /root/.local
 
-# Copy application code
+# Copy application code (templates are in app/templates/)
 COPY src/ ./src/
 COPY app/ ./app/
 COPY config/ ./config/
-COPY templates/ ./templates/
-COPY .env .env
 
 # Add .local/bin to PATH
 ENV PATH=/root/.local/bin:$PATH
 
+# Set environment variables for CI/CD (override with docker-compose or --env-file)
+ENV MLFLOW_TRACKING_URI=""
+ENV DAGSHUB_TOKEN=""
+
 # Expose FastAPI port
 EXPOSE 8000