[GH-5686] Install dbplyr in R docker image (#5687)

Author: krasinski

kubernetes/build.gradle

@@ -68,6 +68,7 @@ task createRDockerfile(type: Dockerfile) {
                 R -e 'install.packages("RCurl", repos = "http://cran.us.r-project.org")' && \\
                 R -e 'install.packages("jsonlite", repos = "http://cran.us.r-project.org")' && \\
                 R -e 'install.packages("testthat", repos = "http://cran.us.r-project.org")' && \\
+                R -e 'install.packages("dbplyr", repos = "http://cran.us.r-project.org")' && \\
                 R -e 'install.packages("sparklyr", repos = "http://cran.us.r-project.org")'
                 """
   copyFile("h2o.tar.gz", "/opt/spark/R/lib/h2o.tar.gz")