Ignore global git config when not root

Flake lock file updates:

• Updated input 'agenix':
    'github:ryantm/agenix/0d5e59ed645e4c7b60174bc6f6aac6a203dc0b01' (2022-04-02)
  → 'github:ryantm/agenix/7e5e58b98c3dcbf497543ff6f22591552ebfe65b' (2022-05-16)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/fb222e008681fce4608e94f2d1dfdf3d03a364c4' (2022-05-13)
  → 'github:NixOS/nixpkgs/1d7db1b9e4cf1ee075a9f52e5c36f7b9f4207502' (2022-05-16)

flake.lock

@@ -7,11 +7,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1648942457,
-        "narHash": "sha256-i29Z1t3sVfCNfpp+KAfeExvpqHQSbLO1KWylTtfradU=",
+        "lastModified": 1652712410,
+        "narHash": "sha256-hMJ2TqLt0DleEnQFGUHK9sV2aAzJPU8pZeiZoqRozbE=",
         "owner": "ryantm",
         "repo": "agenix",
-        "rev": "0d5e59ed645e4c7b60174bc6f6aac6a203dc0b01",
+        "rev": "7e5e58b98c3dcbf497543ff6f22591552ebfe65b",
         "type": "github"
       },
       "original": {
@@ -38,11 +38,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1652467128,
-        "narHash": "sha256-1wuQ7QgPQ3tugYcoVMJ3pUzl4wVdBzKZr9qtJAgA4VI=",
+        "lastModified": 1652659998,
+        "narHash": "sha256-FqNrXC1EE6U2RACwXBlsAvg1lqQGLYpuYb6+W3DL9vA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "fb222e008681fce4608e94f2d1dfdf3d03a364c4",
+        "rev": "1d7db1b9e4cf1ee075a9f52e5c36f7b9f4207502",
         "type": "github"
       },
       "original": {

modules/gui.nix

@@ -46,6 +46,7 @@ with pkgs;
       export XDG_SESSION_TYPE=wayland
       export XDG_CURRENT_DESKTOP=sway
       export NVIM_LISTEN_ADDRESS=/tmp/nvimsocket
+      export GIT_CONFIG_NOSYSTEM=true
     '';
     wrapperFeatures.gtk = true;
   };