Add gpuCI CPU-only script, based on RMM's gpuCI scripts.

.gitignore

@@ -1,8 +1,4 @@
-thrust/system/cuda/detail/.gitignore
-*.bash
 *.log
 .p4config
-run
-build*
 doc/html
 discrete_voronoi.pgm

ci/cpu/build.bash

@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+# Copyright (c) 2018-2020 NVIDIA Corporation
+
+#################################
+# Thrust CPU-only script for CI #
+#################################
+
+set -e
+
+# Logger function for build status output
+function logger() {
+  echo -e "\n>>>> ${@}\n"
+}
+
+# Set path and build parallel level
+export PATH=/usr/local/cuda/bin:${PATH}
+
+# Set home to the job's workspace.
+export HOME=${WORKSPACE}
+
+# Switch to project root; also root of repo checkout.
+cd ${WORKSPACE}
+
+# If it's a nightly build, append current YYMMDD to version.
+if [[ "${BUILD_MODE}" = "branch" ]] ; then
+  export VERSION_SUFFIX=`date +%y%m%d`
+fi
+
+# The Docker image sets up `c++` and `cu++`.
+CMAKE_FLAGS="-DCMAKE_CXX_COMPILER=c++ -DCMAKE_CUDA_COMPILER=cu++"
+
+# If it's a nightly build, build all configurations.
+if [[ "${BUILD_MODE}" = "branch" ]] ; then
+  CMAKE_FLAGS="${CMAKE_FLAGS} -DTHRUST_MULTICONFIG_WORKLOAD=FULL"
+fi
+
+################################################################################
+# SETUP - Check environment.
+################################################################################
+
+logger "Get env..."
+env
+
+logger "Check versions..."
+c++ --version
+cu++ --version
+
+################################################################################
+# BUILD - Build Thrust examples and tests.
+################################################################################
+
+mkdir build
+cd build
+
+logger "Configure Thrust..."
+cmake ${CMAKE_OPTIONS} ..
+
+logger "Build Thrust..."
+cmake --build . -j
+
+################################################################################
+# TEST - Run Thrust CPU-only examples and tests.
+################################################################################
+
+logger "Test Thrust (CPU-only)..."
+ctest -E "^cub|^thrust.*cuda"
+