users/foo-dogsquared: add SSH and GPG client configurations

users/home-manager/foo-dogsquared/default.nix

@@ -47,6 +47,40 @@ in
     fi
   '';
 
+  # My SSH client configuration. It is encouraged to keep matches and extra
+  # configurations included in a separate `config.d/` directory. This enables
+  # it to easily backup the certain files which is most likely what we're
+  # mostly configuring anyways.
+  programs.ssh = {
+    enable = true;
+    includes = [ "config.d/*" ];
+    extraConfig = ''
+      AddKeysToAgent confirm 15m
+      ForwardAgent no
+    '';
+  };
+
+  # My GPG client. It has to make sure the keys are not generated and has to be
+  # backed up somewhere.
+  #
+  # If you want to know how to manage GPG PROPERLY for the nth time, read the
+  # following document:
+  # https://alexcabal.com/creating-the-perfect-gpg-keypair
+  programs.gpg = {
+    enable = true;
+
+    # This is just made to be a starting point, per se.
+    mutableKeys = true;
+    mutableTrust = true;
+
+    settings = {
+      default-key = "0xADE0C41DAB221FCC";
+      keyid-format = "0xlong";
+      with-fingerprint = true;
+      no-comments = false;
+    };
+  };
+
   # My Git credentials.
   programs.git = {
     enable = true;