build: adding CTest stage to CI, prepping CPM use

.github/workflows/cmake.yml

@@ -21,7 +21,10 @@ jobs:
         submodules: recursive
 
     - name: Build
-      uses: threeal/cmake-action@v2.0.0
+      uses: threeal/cmake-action@v2.1.0
       with:
         source-dir: ${{env.unit_test_dir}}
 
+    - name: Test
+      uses: threeal/ctest-action@v1.1.0
+

tools/cmake/CPM.cmake

@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: MIT
+#
+# SPDX-FileCopyrightText: Copyright (c) 2019-2023 Lars Melchior and contributors
+
+set(CPM_DOWNLOAD_VERSION 0.40.2)
+set(CPM_HASH_SUM "c8cdc32c03816538ce22781ed72964dc864b2a34a310d3b7104812a5ca2d835d")
+
+if(CPM_SOURCE_CACHE)
+  set(CPM_DOWNLOAD_LOCATION "${CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+elseif(DEFINED ENV{CPM_SOURCE_CACHE})
+  set(CPM_DOWNLOAD_LOCATION "$ENV{CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+else()
+  set(CPM_DOWNLOAD_LOCATION "${CMAKE_BINARY_DIR}/cmake/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+endif()
+
+# Expand relative path. This is important if the provided path contains a tilde (~)
+get_filename_component(CPM_DOWNLOAD_LOCATION ${CPM_DOWNLOAD_LOCATION} ABSOLUTE)
+
+file(DOWNLOAD
+     https://github.com/cpm-cmake/CPM.cmake/releases/download/v${CPM_DOWNLOAD_VERSION}/CPM.cmake
+     ${CPM_DOWNLOAD_LOCATION} EXPECTED_HASH SHA256=${CPM_HASH_SUM}
+)
+
+include(${CPM_DOWNLOAD_LOCATION})

tools/cmake/setvars.cmake

@@ -1,6 +1,9 @@
+include_guard()
+
 get_filename_component(TOOLS_DIR ${CMAKE_CURRENT_LIST_DIR} ABSOLUTE)
 get_filename_component(ROOT_DIR ${TOOLS_DIR}/../.. ABSOLUTE)
 set(ESTD_DIR ${ROOT_DIR}/src)
 
+include(${TOOLS_DIR}/CPM.cmake)
 include(${TOOLS_DIR}/fetchcontent.cmake)
 include(${TOOLS_DIR}/options.cmake)