[Devbox] Add ssh-agent-switcher package.

Signed-off-by: jmug <u.g.a.mariano@gmail.com>

flake.nix

@@ -35,6 +35,11 @@
     walker = {
       url = "github:abenz1267/walker/v0.12.23";
     };
+
+    # ssh-agent forwarder for linux.
+    ssh-agent-switcher = {
+      url = "github:AYM1607/ssh-agent-switcher/6cd7ce973cf08656d42e475945216d8c0f0b0c7b"
+    }
   };
 
   outputs = {
@@ -47,7 +52,9 @@
     nixos-hardware,
     home-manager,
     ghostty,
-    nixgl, ...
+    nixgl,
+    ssh-agent-switcher,
+    ...
   }@inputs: {
     nixosConfigurations = {
       nixlap = nixpkgs.lib.nixosSystem {

hosts/devbox/home.nix

@@ -1,4 +1,4 @@
-{ config, pkgs, ... } :
+{ inputs, config, pkgs, ... } :
 
 {
 
@@ -28,6 +28,13 @@
       exercism
       # Thin provisioning tools
       thin-provisioning-tools
+      pkgs.writeShellApplication {
+        name = "sas";
+        runtimeInputs = [ inputs.ssh-agent-switcher.aarch64-linux.default ];
+        text = ''
+          ssh-agent-switcher
+        '';
+      }
     ];
 
     stateVersion = "24.11";