Merge pull request #28344 from bfredl/wonderland

feat(build): build.zig MVP: build and run functionaltests on linux

runtime/doc/news.txt

@@ -110,6 +110,12 @@ API
   it would return `nil`, which made it impossible to tell if the directory was
   actually trusted.
 
+BUILD
+
+• A Zig-based build system has been added as an alternative to CMake. It is
+  currently limited in functionality, and CMake remains the recommended option
+  for the time being.
+
 DEFAULTS
 
 • 'statusline' default is exposed as a statusline expression (previously it