home: add gpg

Configures both `gpg` and `gpg-agent`

home/default.nix

@@ -5,6 +5,7 @@
     ./direnv.nix
     ./documentation.nix
     ./git
+    ./gpg.nix
     ./htop.nix
     ./jq.nix
     ./packages.nix

home/gpg.nix

@@ -0,0 +1,14 @@
+{ ... }:
+{
+  programs.gpg = {
+    enable = true;
+  };
+
+  services.gpg-agent = {
+    enable = true;
+    enableSshSupport = true; # One agent to rule them all
+    extraConfig = ''
+      allow-loopback-pinentry
+    '';
+  };
+}