CODEOWNERS: maintainers for dockerTools (#102749)

* CODEOWNERS: maintainers for docker-tools

* CODEOWNERS: Add roberth to Docker tools

Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>

.github/CODEOWNERS

@@ -206,6 +206,12 @@
 /nixos/tests/cri-o.nix                       @NixOS/podman @zowoq
 /nixos/tests/podman.nix                      @NixOS/podman @zowoq
 
+# Docker tools
+/pkgs/build-support/docker                   @roberth
+/nixos/tests/docker-tools-overlay.nix        @roberth
+/nixos/tests/docker-tools.nix                @roberth
+/doc/builders/images/dockertools.xml         @roberth
+
 # Blockchains
 /pkgs/applications/blockchains  @mmahut