Update Dockerfile

Dockerfile

@@ -1,25 +1,16 @@
-FROM openanalytics/r-ver:4.1.3
+#get standard R container
+FROM rocker/r-ver
 
-# system libraries of general use
-RUN apt-get update && apt-get install --no-install-recommends -y \
-    pandoc \
-    pandoc-citeproc \
-    libcurl4-gnutls-dev \
-    libcairo2-dev \
-    libxt-dev \
-    libssl-dev \
-    libssh2-1-dev \
-    libssl1.1 \
-    libmpfr-dev \
-    && rm -rf /var/lib/apt/lists/*
-
-# basic shiny functionality
+# basic packages for shiny functionality
 RUN R -q -e "install.packages(c('shiny', 'rmarkdown'))"
 
 # copy the app to the image
 WORKDIR /shinyapp
 COPY --link Rprofile.site /usr/local/lib/R/etc/
+
+# copy R profile for configuring port
 COPY --link app.R /shinyapp/app.R
 
+#Expose port of HF space
 EXPOSE 7860
 CMD ["R", "-q", "-e", "shiny::runApp('/shinyapp')"]