ctucx.git: nixfiles

machines/osterei/git/stagit: add category `nix`

diff --git a/machines/osterei/git/stagit.nix b/machines/osterei/git/stagit.nix
@@ -25,7 +25,7 @@ let
       # generate index arguments
       args="-n 'ctucx.git' -e 'git@ctu.cx'"
 
-      for category in "etc" "nimlang" "nimlang libraries" "php" "archive"; do
+      for category in "nix" "etc" "nimlang" "nimlang libraries" "php" "archive"; do
         args="$args -c '$category'"
         for repo in "$HOME/repositories/"*.git/; do
           repo="''${repo%/}"