ssh: set SSH_AUTH_SOCK systemwide

modules/services/ssh.nix

@@ -3,11 +3,10 @@
 in {
   options.modules.programs.ssh.enable = mkEnableOption "ssh";
   config = {
+    # set the ssh socket globally. This alows all applications and shells to use
+    # the ssh-agent.
+    environment.sessionVariables.SSH_AUTH_SOCK = "/run/user/1000/ssh-agent";
     programs.ssh.startAgent = true;
-    # programs.ssh.pubkeyAcceptedKeyTypes = [
-    #   "ssh-rsa"
-    #   "ecdsa-sha2-nistp521"
-    # ];
 
     services.openssh = {
       enable = true;

packages/shell/default.nix

@@ -28,7 +28,6 @@ in
     buildInputs = [pkgs.makeWrapper];
     postBuild = ''
       wrapProgram $out/bin/fish --set STARSHIP_CONFIG "${toml.generate "starship.toml" starship-config}" \
-      --set SSH_AUTH_SOCK /run/user/1000/ssh-agent \
     '';
   })
   .overrideAttrs (_: {