Update Dockerfile

Dockerfile

@@ -30,4 +30,6 @@ RUN R -e "install.packages(c('shiny','dplyr','ggplot2','readr','ggExtra'), repos
 COPY . /srv/shiny-server/
 WORKDIR /srv/shiny-server/
 EXPOSE 7860
-CMD [\"R\", \"-e\", \"shiny::runApp(host='0.0.0.0', port=7860)\"] 
+
+# Exec form — each element is a separate JSON string, no escape characters inside the file.
+CMD ["R", "-e", "shiny::runApp(host='0.0.0.0', port=7860)"]