General: manage git-crypt config

modules/users/aires/default.nix

@@ -50,6 +50,7 @@ in
         # Configure home-manager
         home-manager.users.aires = {
           imports = [
+            ../common/home-manager/git-crypt.nix
             ../common/home-manager/gnome.nix
             ../common/home-manager/zsh.nix
           ];

modules/users/common/home-manager/git-crypt.nix

@@ -0,0 +1,16 @@
+# Configure Git to support git-crypt
+{ pkgs, ... }:
+{
+  programs.git = {
+    extraConfig = {
+      filter."git-crypt" = {
+        required = true;
+        smudge = "/run/current-system/sw/bin/git-crypt smudge";
+        clean = "/run/current-system/sw/bin/git-crypt clean";
+      };
+      diff."git-crypt" = {
+        textconv = "/run/current-system/sw/bin/git-crypt diff";
+      };
+    };
+  };
+}

modules/users/gremlin/default.nix

@@ -51,6 +51,7 @@ in
 
       home-manager.users.gremlin = {
         imports = [
+          ../common/home-manager/git-crypt.nix
           ../common/home-manager/gnome.nix
           ../common/home-manager/zsh.nix
         ];

modules/users/root/default.nix

@@ -2,6 +2,7 @@
 {
   # Give root user access to run remote builds
   home-manager.users.root = {
+    imports = [ ../common/home-manager/git-crypt.nix ];
     home.stateVersion = "24.05";
     programs = {
       ssh = {