Add ctags package to development

ctags is used by Kate with its project plugin code indexing.
This helps Kate users to search for symbols (functions etc) inside
a project, or between different projects.

Without ctags, the code indexing wont work.

mkosi.conf.d/99-packages-development.conf

@@ -9,6 +9,7 @@ Packages=base-devel
          clazy
          cmake
          crun # default for podman
+         ctags
          distrobox
          docker
          docker-buildx