Optimising dockerfile with a two stage build for a shiny app using renv and golem

shiny
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1

Hi,
I'm trying to optimize the dockerfile of a perfectly running shinyapp. I'd like to take advantage of docker's multistep build to avoid reinstalling all the dependencies each time I modify the app's code, but things aren't going as expected and after the RUN R CMD install /build/myapp I get the following error: installing to library ‘/usr/local/lib/R/site-library’ ERROR: dependencies [all deps listed in the DESCRIPTION file on my app] are not available for package ‘myapp’.
This is the dockerfile of the app, can you help me to figure out what's wrong with it?

FROM rocker/r-ver:4.4.1 AS base

RUN echo "\noptions(shiny.port=3838, shiny.host='0.0.0.0')" >> /usr/local/lib/R/etc/Rprofile.site

# system libraries of general use
RUN apt-get update -y && \
    apt-get install -y \
    pandoc \
    pandoc-citeproc \
    libcairo2-dev \
    libxt-dev \
    make \
    zlib1g-dev \
    libcurl4-openssl-dev \
    libssl-dev \
    git \
    libicu-dev \
    # tinytex
    perl \
    wget \
    libfontconfig1 && \
    # cleaning
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# pin renv version
ENV RENV_VERSION="1.0.7"
RUN R -q -e "options(warn=2); install.packages('remotes')"
RUN R -q -e "options(warn=2); remotes::install_version('renv', '${RENV_VERSION}')"

# install R dependencies
# do this before copying the app-code, to ensure this layer is cached
WORKDIR /build
COPY myapp/renv.lock /build/renv.lock
RUN mkdir -p /build/renv
COPY myapp/.Rprofile /build/.Rprofile
COPY myapp/renv/activate.R /build/renv/activate.R
COPY myapp/renv/settings.json /build/renv/settings.json
RUN mkdir /build/renv/.cache
ENV RENV_PATHS_CACHE /build/renv/.cache
RUN R -q -e 'options(warn=2); renv::restore()'

# install TinyTex and latex dependencies
ENV PATH="${PATH}:/root/bin"
ENV CTAN_REPO="https://mirror.ctan.org/systems/texlive/tlnet"
RUN wget -qO- "https://yihui.org/tinytex/install-bin-unix.sh" | sh && \
    fmtutil-sys --all && \
    tlmgr install \
    koma-script \
    graphics \
    microtype \
    tex-gyre \
    fancyhdr \
    lastpage \
    booktabs
    
FROM base AS runtime

COPY --from=base /usr/local/lib/R/ /usr/local/lib/R/
COPY --from=base /root/.TinyTeX/ /root/.TinyTeX/

WORKDIR /build
COPY --from=base /build .

# install R code
COPY myapp /build/myapp
RUN R CMD INSTALL /build/myapp

RUN groupadd -g 1000 shiny && useradd -c 'shiny' -u 1000 -g 1000 -m -d /home/shiny -s /sbin/nologin shiny
USER shiny

EXPOSE 3838

CMD R -e "myapp::run_app()"

The structure of myapp folder is:

myapp\
|- Dockerfile
|-...
|- myapp\
         |- DESCRIPTION
         |- renv.lock
         |- app.R
         |-...
         |- renv\
         |- R\
         |- inst
         |- tests\
         |-...