Building a shinyproxy Dockerfile based on rhub/r-minimal for R shiny app

Dockerfile

# Ressources:
# - https://github.com/r-hub/r-minimal
# - https://hosting.analythium.io/best-practices-for-r-with-docker/

# NOTE
# does not support Cairo or x11 add hoc, hence renderPlot will not work, renderPlotly und JS backends are working fine

# TEST and DEBUG
# - build: sudo docker build --build-arg http_proxy=x --build-arg https_proxy=x -t shiny_app_alpine .
# - run: sudo docker run -it -p 3899:3838 -v /home/xyz/:/home/xyz/ shiny_app_alpine
# - then visit the server locally and open localhost:3899 to see and test the app in live docker run session

FROM rhub/r-minimal

RUN apk update
RUN apk add --no-cache \
            --update-cache \
            autoconf \
            automake \
            bash \
            tzdata

RUN echo "Europe/Berlin" > /etc/timezone

ENV HTTP_PROXY="x"
ENV HTTPS_PROXY="x"

# install packages with 'installr' utility of 'rhub/r-minimal', for instance:
RUN installr -d \
            -t "file linux-headers libxml2-dev gnutls-dev openssl-dev libxt-dev" \
            -a "libxml2 libx11 font-xfree86-type1 icu R-dev mariadb-dev" \
            waiter \
            config \
            pool\
            logging \
            ISOweek \
            DBI \
            RMariaDB \
            shiny \
            shinydashboard \
            shinyWidgets \
            shinyjs\ 
            htmlwidgets \
            shinyBS \
            plotly \
            openxlsx \
            formattable \
            shinycssloaders \
            data.table \
            DT \
            ggplot2 \
            shinybusy \
            dplyr \
            future \
            promises \
            lubridate \
            truncnorm Rsolnp #dependencies for qualityTools

# custom packages install from archive, for instance:
RUN R -e "url <- 'https://cran.r-project.org/src/contrib/Archive/qualityTools/qualityTools_1.55.tar.gz'; \
          pkgFile <- 'qualityTools_1.55.tar.gz'; \
          download.file(url = url, destfile = pkgFile); \
          install.packages(pkgs=pkgFile, type='source'); \
          unlink(pkgFile)"
            
LABEL maintainer="john.doe@company-international.com"
LABEL build_date="2022-09-20"
LABEL version=1.2.3

RUN mkdir /home/app

WORKDIR /home/app
COPY local_app/global.R .
COPY local_app/server.R .
COPY local_app/ui.R .
COPY local_app/www www

RUN rm -rf /var/cache/apk/*
  
RUN addgroup --system app && adduser --system --ingroup app app
RUN chown app:app -R /home/app
USER app

EXPOSE 3838

CMD ["R", "-e", "options(tz='Europe/Berlin', shiny.port = 3838, shiny.host = '0.0.0.0'); shiny::runApp('/home/app')"]