ci: Add nightly job to build CMake with PCH on macOS

.gitlab/ci/configure_macos_arm64_pch.cmake

@@ -0,0 +1,7 @@
+set(CMake_BUILD_PCH "ON" CACHE BOOL "")
+
+# sccache does not forward the PCH '-Xarch_arm64 "-include/..."' flag correctly.
+set(configure_no_sccache 1)
+
+include("${CMAKE_CURRENT_LIST_DIR}/configure_macos_common.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}/configure_common.cmake")

.gitlab/os-macos.yml

@@ -38,6 +38,12 @@
         CMAKE_CONFIGURATION: macos_arm64_ninja
         CTEST_NO_WARNINGS_ALLOWED: 1
 
+.macos_arm64_pch:
+    extends: .macos_arm64_ninja
+
+    variables:
+        CMAKE_CONFIGURATION: macos_arm64_pch
+
 .macos_x86_64_makefiles:
     extends: .macos_build