[ci] Fix CI job for R artifact (#4811)

* Update .vsts-ci.yml

* Update .vsts-ci.yml

* Update .vsts-ci.yml

* Update .vsts-ci.yml

* Update .vsts-ci.yml

* Try `RD` and `RDscript`

* Update .vsts-ci.yml
Co-authored-by: James Lamb <jaylamb20@gmail.com>

.vsts-ci.yml

@@ -300,8 +300,11 @@ jobs:
   steps:
   - script: |
       LGB_VER=$(head -n 1 VERSION.txt | sed "s/rc/-/g")
-      Rscript -e "install.packages(c('R6', 'data.table', 'jsonlite', 'knitr', 'Matrix', 'rmarkdown'), dependencies = c('Depends', 'Imports', 'LinkingTo'), repos = 'https://cran.r-project.org', Ncpus = parallel::detectCores())" || exit -1
-      sh build-cran-package.sh || exit -1
+      R_LIB_PATH=~/Rlib
+      export R_LIBS=${R_LIB_PATH}
+      mkdir -p ${R_LIB_PATH}
+      RDscript -e "install.packages(c('R6', 'data.table', 'jsonlite', 'knitr', 'Matrix', 'rmarkdown'),  lib = '${R_LIB_PATH}', dependencies = c('Depends', 'Imports', 'LinkingTo'), repos = 'https://cran.r-project.org', Ncpus = parallel::detectCores())" || exit -1
+      sh build-cran-package.sh --r-executable=RD || exit -1
       mv lightgbm_${LGB_VER}.tar.gz $(Build.ArtifactStagingDirectory)/lightgbm-${LGB_VER}-r-cran.tar.gz
     displayName: 'Build CRAN R-package'
   - task: PublishBuildArtifacts@1