update Dockerfiles to use BiocManager instead of online R script (#105)

tidyverse/3.5.1/Dockerfile

@@ -9,7 +9,6 @@ RUN apt-get update -qq && apt-get -y --no-install-recommends install \
   libpq-dev \
   libssh2-1-dev \
   unixodbc-dev \
-  && R -e "source('https://bioconductor.org/biocLite.R')" \
   && install2.r --error \
     --deps TRUE \
     tidyverse \
@@ -18,5 +17,6 @@ RUN apt-get update -qq && apt-get -y --no-install-recommends install \
     formatR \
     remotes \
     selectr \
-    caTools
+    caTools \
+    BiocManager
 

tidyverse/Dockerfile

@@ -9,7 +9,6 @@ RUN apt-get update -qq && apt-get -y --no-install-recommends install \
   libpq-dev \
   libssh2-1-dev \
   unixodbc-dev \
-  && R -e "source('https://bioconductor.org/biocLite.R')" \
   && install2.r --error \
     --deps TRUE \
     tidyverse \
@@ -18,6 +17,7 @@ RUN apt-get update -qq && apt-get -y --no-install-recommends install \
     formatR \
     remotes \
     selectr \
-    caTools
+    caTools \
+    BiocManager
 
 # not clear why selectr needs explicit re-install, see https://github.com/rocker-org/rocker-versioned/pull/63

tidyverse/devel/Dockerfile

@@ -8,7 +8,6 @@ RUN apt-get update -qq && apt-get -y --no-install-recommends install \
   libmariadb-client-lgpl-dev \
   libpq-dev \
   libssh2-1-dev \
-  && R -e "source('https://bioconductor.org/biocLite.R')" \
   && install2.r --error \
     --deps TRUE \
     tidyverse \
@@ -16,7 +15,8 @@ RUN apt-get update -qq && apt-get -y --no-install-recommends install \
     devtools \
     formatR \
     remotes \
-    selectr
+    selectr \
+    BiocManager
 
 ## Notes: Above install2.r uses --deps TRUE to get Suggests dependencies as well,
 ## dplyr and ggplot are already part of tidyverse, but listed explicitly to get their (many) suggested dependencies.