Add package configr to Dockerfile.

Dockerfile

@@ -12,7 +12,7 @@ RUN apt update && apt install -y libssl-dev liblzma-dev libbz2-dev libicu-dev li
 
 RUN R CMD javareconf
 
-# Create a directory to mount eventual data
+# Create directories to mount eventual data
 RUN mkdir -p /data
 ENV DATADIR="/data"
 
@@ -32,7 +32,7 @@ COPY imageViewer /home/ide/app/image-data-explorer/imageViewer
 # Install required R packages
 RUN R -e "install.packages(c('remotes', 'rversions', 'roxygen2', 'xml2', 'devtools'), repos=c('https://cloud.r-project.org/', 'https://ftp.gwdg.de/pub/misc/cran/')); \
 install.packages(c('data.table', 'shiny', 'DT', 'shinyFiles', 'shinycssloaders', 'shinydashboard', 'shinyjs', 'shinyWidgets', 'shinybusy', 'assertthat'), repos=c('https://cloud.r-project.org/', 'https://ftp.gwdg.de/pub/misc/cran/')); \
-install.packages(c('ggplot2', 'plotly', 'RANN', 'MASS', 'dbscan', 'uwot', 'xgboost', 'Ckmeans.1d.dp', 'e1071', 'caret', 'RColorBrewer', 'aws.s3'), repos=c('https://cloud.r-project.org/', 'https://ftp.gwdg.de/pub/misc/cran/')); \
+install.packages(c('ggplot2', 'plotly', 'RANN', 'MASS', 'dbscan', 'uwot', 'xgboost', 'Ckmeans.1d.dp', 'e1071', 'caret', 'RColorBrewer', 'aws.s3', 'configr'), repos=c('https://cloud.r-project.org/', 'https://ftp.gwdg.de/pub/misc/cran/')); \
 install.packages('BiocManager', repos=c('https://cloud.r-project.org/', 'https://ftp.gwdg.de/pub/misc/cran/')); \
 install.packages(c('rJava', 'RCurl')); BiocManager::install('EBImage'); BiocManager::install('aoles/RBioFormats'); \
 library(devtools); setwd('/home/ide/app/image-data-explorer/imageViewer'); install();"