Nixify .ssh/config using home-manager

This commit nixify's the .ssh/config using home-manager resolves #36

home/default.nix

@@ -10,6 +10,7 @@
           ./tmux.nix
           ./neovim.nix
           ./helix.nix
+          ./ssh.nix
           ./starship.nix
           ./terminal.nix
           ./git.nix

home/ssh.nix

@@ -0,0 +1,40 @@
+{ config
+, pkgs
+, lib
+, ...
+}:
+with lib;
+let
+  inherit (pkgs) stdenv;
+in
+{
+  programs.ssh = {
+    enable = true;
+    matchBlocks = {
+      "*".extraOptions = mkMerge [
+        (mkIf (!stdenv.isDarwin) {
+          identityAgent = "${config.home.homeDirectory}/.1password/agent.sock";
+        })
+        (mkIf (stdenv.isDarwin) {
+          identityAgent = "~/Library/Group Containers/2BUA8C4S2C.com.1password/t/agent.sock";
+        })
+      ];
+      actual = {
+        hostname = "167.205.125.179";
+        forwardAgent = true;
+      };
+      biryani = {
+        hostname = "100.97.32.60";
+        user = "admin";
+        forwardAgent = true;
+      };
+      # To clone Juspay repos.
+      # https://developer.1password.com/docs/ssh/agent/advanced/#match-key-with-host
+      "bitbucket.org" = {
+        identitiesOnly = true;
+        identityFile = "${config.home.homeDirectory}/.ssh/juspay.pub";
+      };
+    };
+  };
+}
+