Use CMAKE_BUILD_TYPE instead of hard coded "Release"

test/CMakeLists.txt

@@ -25,7 +25,7 @@ ExternalProject_Add(check-unit-test-framework
   BUILD_IN_SOURCE 1
   PATCH_COMMAND ${CHECK_PATCH_COMMAND}
   CMAKE_ARGS
-    "-DCMAKE_BUILD_TYPE=Release"
+    "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}"
     "-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}"
     "-DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>"
   LOG_DOWNLOAD ${THIRD_PARTY_LOGGING}