Deal with corrupt rdb file issue

When `pkgbuild` is updated because the base docker image
has an outdated version and is then used to install a package,
the error pkgbuild.rdb is corrupt comes up. By updating packages
in a separate R session from where the git checkout package is 
built, we can (usually) avoid the problem.

Author: seandavi

Dockerfile

@@ -4,4 +4,6 @@ WORKDIR /home/rstudio
 
 COPY --chown=rstudio:rstudio . /home/rstudio/
 
+RUN Rscript -e "options(repos = c(CRAN = 'https://cran.r-project.org')); BiocManager::install(ask=FALSE)"
+
 RUN Rscript -e "options(repos = c(CRAN = 'https://cran.r-project.org')); devtools::install('.', dependencies=TRUE, build_vignettes=TRUE, repos = BiocManager::repositories())"