Dockerfile

FROM rocker/shiny:latest

WORKDIR /code

# Minimal system deps for headless Chromium (webshot2) + TLS
RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
    chromium \
    libnss3 \
    libgbm1 \
    libx11-6 \
    libxrender1 \
    libxext6 \
    libgtk-3-0 \
    fonts-liberation \
    fonts-dejavu \
    ca-certificates \
 && rm -rf /var/lib/apt/lists/*

# Let webshot2/chromote find Chromium and use safe flags in containers
ENV CHROME_BIN=/usr/bin/chromium
ENV CHROMOTE_CHROME=/usr/bin/chromium
ENV CHROMOTE_CHROME_ARGS="--no-sandbox --disable-dev-shm-usage"

# R packages used by this app
RUN install2.r --error --skipinstalled \
    shiny \
    shinydashboard \
    DT \
    dplyr \
    shinyjs \
    readr \
    webshot2 \
    htmlwidgets \
    ggplot2

# App code
COPY . /code

# Serve on 7860 to match your runApp call
EXPOSE 7860

# Run app (respects $PORT if set by the platform)
CMD ["R", "--quiet", "-e", "options(shiny.port=as.integer(Sys.getenv('PORT', 7860)), shiny.host='0.0.0.0'); shiny::runApp('/code')"]