[ci] build CRAN R-package on Azure with every commit and attach it to…

… releases (#4117)

* build CRAN R-package on Azure with every commit and attach to releases

* test CI

* fix path

* revert CI test

.github/workflows/triggering_comments.yml

@@ -25,14 +25,6 @@ jobs:
           "${{ github.event.comment.id }}" \
           "gha_run_r_valgrind"
 
-    - name: Trigger R artifact builds
-      if: github.event.comment.body == '/gha run build-r-artifacts'
-      run: |
-        $GITHUB_WORKSPACE/.ci/trigger_dispatch_run.sh \
-          "${{ github.event.issue.pull_request.url }}" \
-          "${{ github.event.comment.id }}" \
-          "gha_run_build_r_artifacts"
-
     - name: Trigger R Solaris CRAN checks
       if: github.event.comment.body == '/gha run r-solaris'
       run: |

.vsts-ci.yml

@@ -18,6 +18,8 @@ resources:
   - container: ubuntu-latest
     image: 'ubuntu:latest'
     options: "--name ci-container -v /usr/bin/docker:/tmp/docker:ro"
+  - container: rbase
+    image: rocker/r-base
 jobs:
 ###########################################
 - job: Linux
@@ -200,7 +202,7 @@ jobs:
       artifactName: PackageAssets
       artifactType: container
 ###########################################
-- job: MacOS
+- job: macOS
 ###########################################
   variables:
     COMPILER: clang
@@ -274,6 +276,25 @@ jobs:
       pathtoPublish: '$(Build.ArtifactStagingDirectory)'
       artifactName: PackageAssets
       artifactType: container
+###########################################
+- job: R_artifact
+###########################################
+  condition: not(startsWith(variables['Build.SourceBranch'], 'refs/pull/'))
+  pool:
+    vmImage: 'ubuntu-latest'
+  container: rbase
+  steps:
+  - script: |
+      LGB_VER=$(head -n 1 VERSION.txt | sed "s/rc/-/g")
+      sh build-cran-package.sh || 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
+    condition: succeeded()
+    inputs:
+      pathtoPublish: $(Build.ArtifactStagingDirectory)
+      artifactName: R-package
+      artifactType: container
 
 ###########################################
 - job: Package
@@ -282,8 +303,9 @@ jobs:
   - Linux
   - Linux_latest
   - QEMU_multiarch
-  - MacOS
+  - macOS
   - Windows
+  - R_artifact
   condition: and(succeeded(), not(startsWith(variables['Build.SourceBranch'], 'refs/pull/')))
   pool:
     vmImage: 'ubuntu-latest'
@@ -314,6 +336,12 @@ jobs:
     inputs:
       artifactName: PackageAssets
       downloadPath: $(Build.SourcesDirectory)/binaries
+  - task: DownloadBuildArtifacts@0
+    displayName: Download R-package
+    condition: and(succeeded(), startsWith(variables['Build.SourceBranch'], 'refs/tags/v'))
+    inputs:
+      artifactName: R-package
+      downloadPath: $(Build.SourcesDirectory)/R
   - script: |
       python "$(Build.SourcesDirectory)/.nuget/create_nuget.py" "$(Build.SourcesDirectory)/binaries/PackageAssets"
     displayName: 'Create NuGet configuration files'
@@ -339,6 +367,7 @@ jobs:
       title: '$(Build.SourceBranchName)'
       assets: |
         $(Build.SourcesDirectory)/binaries/PackageAssets/*
+        $(Build.SourcesDirectory)/R/R-package/*
         $(Build.ArtifactStagingDirectory)/nuget/*.nupkg
         $(Build.ArtifactStagingDirectory)/archives/*
       assetUploadMode: 'delete'

R-package/README.md

@@ -266,11 +266,7 @@ sh build-cran-package.sh
 
 This will create a file `lightgbm_${VERSION}.tar.gz`, where `VERSION` is the version of `LightGBM`.
 
-Alternatively, GitHub Actions can generate this file for you. On a pull request, create a comment with this phrase:
-
-> /gha run build-r-artifacts
-
-Go to https://github.com/microsoft/LightGBM/actions, and find the most recent run of the "R artifact builds" workflow. If it ran successfully, you'll find a download link for the package (in `.zip` format) in that run's "Artifacts" section.
+Also, CRAN package is generated with every commit to any repo's branch and can be found in "Artifacts" section of the associated Azure Pipelines run.
 
 ### Standard Installation from CRAN Package