contour: Provide terminfo in separate output

nixos/modules/config/terminfo.nix

···
     #  pkgs)
     environment.systemPackages = mkIf config.environment.enableAllTerminfo (map (x: x.terminfo) (with pkgs; [
       alacritty
+      contour
       foot
       kitty
       mtm

pkgs/applications/terminal-emulators/contour/default.nix

···
     sha256 = "sha256-TpxVC0GFZD3jGISnDWHKEetgVVpznm5k/Vc2dwVfSG4=";
   };
 
+  outputs = [ "out" "terminfo" ];
+
   nativeBuildInputs = [
     cmake
     pkg-config
···
 
     # Don't fix Darwin app bundle
     sed -i '/fixup_bundle/d' src/contour/CMakeLists.txt
+  '';
+
+  postInstall = ''
+    mkdir -p $out/nix-support $terminfo/share
+    mv $out/share/terminfo $terminfo/share/
+    echo "$terminfo" >> $out/nix-support/propagated-user-env-packages
   '';
 
   passthru.tests.test = nixosTests.terminal-emulators.contour;