home: create 'modules/home' folder

Consolidating all modules under the same path, to clear out the
top-level directory.

modules/home/ssh/default.nix

@@ -0,0 +1,54 @@
+{ config, lib, ... }:
+let
+  cfg = config.my.home.ssh;
+in
+{
+  options.my.home.ssh = with lib; {
+    enable = my.mkDisableOption "ssh configuration";
+  };
+
+  config.programs.ssh = lib.mkIf cfg.enable {
+    enable = true;
+
+    includes = [
+      # Local configuration, not-versioned
+      "config.local"
+    ];
+
+    matchBlocks = {
+      "github.com" = {
+        hostname = "github.com";
+        identityFile = "~/.ssh/shared_rsa";
+        user = "git";
+      };
+
+      "gitlab.com" = {
+        hostname = "gitlab.com";
+        identityFile = "~/.ssh/shared_rsa";
+        user = "git";
+      };
+
+      "git.sr.ht" = {
+        hostname = "git.sr.ht";
+        identityFile = "~/.ssh/shared_rsa";
+        user = "git";
+      };
+
+      "git.belanyi.fr" = {
+        hostname = "git.belanyi.fr";
+        identityFile = "~/.ssh/shared_rsa";
+        user = "git";
+      };
+
+      porthos = {
+        hostname = "91.121.177.163";
+        identityFile = "~/.ssh/shared_rsa";
+        user = "ambroisie";
+      };
+    };
+
+    extraConfig = ''
+      AddKeysToAgent yes
+    '';
+  };
+}