fix: move copy step up

backend/playout/Dockerfile

@@ -18,12 +18,12 @@ RUN apk add --no-cache \
     bash
 
 WORKDIR /app
+# Copy demo data for out-of-the-box playout
+COPY demodata/ /app/
 
 COPY --from=builder /playlist-manager /app/playlist-manager
 COPY start-playout.sh /app/
 
-# Copy demo data for out-of-the-box playout
-COPY demodata/ /app/
 
 # Create directories for playlist, media, and HLS output
 RUN mkdir -p /app/hls