Fix R package build on CI. (#8445)

Co-authored-by: Hyunsu Cho <chohyu01@cs.washington.edu>

tests/ci_build/build_r_pkg_with_cuda.sh

@@ -10,7 +10,7 @@ fi
 
 commit_hash="$1"
 
-make Rpack
+python tests/ci_build/test_r_package.py --task=pack
 mv xgboost/ xgboost_rpack/
 
 mkdir build

tests/ci_build/build_r_pkg_with_cuda_win64.sh

@@ -9,8 +9,11 @@ then
 fi
 
 commit_hash="$1"
+# Clear all positional args
+set --
 
-MAKE="/c/Rtools/bin/make" /c/Rtools/bin/make Rpack
+source activate
+python tests/ci_build/test_r_package.py --task=pack
 mv xgboost/ xgboost_rpack/
 
 mkdir build
@@ -31,4 +34,4 @@ echo 'all:' > xgboost_rpack/src/Makefile
 echo 'all:' > xgboost_rpack/src/Makefile.win
 mv xgboost_rpack/ xgboost/
 /c/Rtools/bin/tar -cvf xgboost_r_gpu_win64_${commit_hash}.tar xgboost/
-/c/Rtools/bin/gzip -9c xgboost_r_gpu_win64_${commit_hash}.tar > xgboost_r_gpu_win64_${commit_hash}.tar.gz
+/c/Rtools/bin/gzip -9c xgboost_r_gpu_win64_${commit_hash}.tar > xgboost_r_gpu_win64_${commit_hash}.tar.gz

tests/ci_build/test_r_package.py

@@ -251,7 +251,9 @@ def test_with_cmake(args: argparse.Namespace) -> None:
 
 @record_time
 def main(args: argparse.Namespace) -> None:
-    if args.task == "build":
+    if args.task == "pack":
+        pack_rpackage()
+    elif args.task == "build":
         src_dir = pack_rpackage()
         build_rpackage(src_dir)
     elif args.task == "doc":
@@ -280,7 +282,7 @@ if __name__ == "__main__":
     parser.add_argument(
         "--task",
         type=str,
-        choices=["build", "check", "doc"],
+        choices=["pack", "build", "check", "doc"],
         default="check",
         required=False,
     )