feat: Move home.nix into this repo

This makes it much easier to test and apply changes.

home/users.nix

@@ -0,0 +1,30 @@
+{ config, lib, ... }:
+let
+  inherit (config) jhome;
+  inherit (cfg.defaultIdentity) gpgKey;
+
+  cfg = jhome.user;
+  hasConfig = jhome.enable && cfg != null;
+  hasKey = gpgKey != null;
+  gpgHome = config.programs.gpg.homedir;
+  unlockKey = hasConfig && cfg.unlockGpgKeyOnLogin && hasKey;
+in
+{
+  config = lib.mkMerge [
+    (lib.mkIf hasConfig {
+      programs.git.userName = cfg.defaultIdentity.name;
+      programs.git.userEmail = cfg.defaultIdentity.email;
+      programs.git.signing = lib.mkIf hasKey {
+        signByDefault = true;
+        key = gpgKey;
+      };
+    })
+    (lib.mkIf unlockKey {
+      xdg.configFile.pam-gnupg.text = ''
+        ${gpgHome}
+
+        ${gpgKey}
+      '';
+    })
+  ];
+}