home: Add gpg config

Also use the opportunity to switch to a new gpg key.

users/simon/modules/default.nix

@@ -3,6 +3,7 @@
     ./alacritty.nix
     ./anki.nix
     ./git.nix
+    ./gpg.nix
     ./gtk.nix
     ./htop.nix
     ./misc.nix

users/simon/modules/git.nix

@@ -1,10 +1,11 @@
+{ config, ... }:
 {
   programs.git = {
     enable = true;
     userName = "Simon Bruder";
     userEmail = "simon@sbruder.de";
     signing = {
-      key = "51276B7B829AF24674F2AA716F03E0000CC5B62F";
+      key = config.programs.gpg.settings.default-key;
       signByDefault = true;
     };
 

users/simon/modules/gpg.nix

@@ -0,0 +1,8 @@
+{
+  programs.gpg = {
+    enable = true;
+    settings = {
+      default-key = "47E7559E037A35652DBBF8AA8D3C82F9F309F8EC";
+    };
+  };
+}