fix build ep9

Author: sparkoo

Dockerfile

@@ -40,6 +40,7 @@ RUN apt-get update && apt-get install -y ca-certificates
 
 COPY --from=builder_go /csgo-2d-demo-player/_output/main /csgo-2d-demo-player/
 COPY --from=builder_go /csgo-2d-demo-player/assets/ /csgo-2d-demo-player/assets/
+COPY --from=builder_npm /csgo-2d-demo-player/web/dist/assets/. /csgo-2d-demo-player/assets/
 COPY --from=builder_npm /csgo-2d-demo-player/web/dist/ /csgo-2d-demo-player/web/dist/
 
 WORKDIR /csgo-2d-demo-player