Use KeepassXC as SSH Agent

This replaces the configuration of files per ssh match block,
as well as the need for keychain.

See: https://keepassxc.org/docs/KeePassXC_UserGuide#_ssh_agent

home/files/keepassxc-ini.nix

@@ -45,4 +45,8 @@
     LockDatabaseIdleSeconds = 120;
     Security_HideNotes = true;
   };
+
+  SSHAgent = {
+    Enabled = true;
+  };
 }

home/programs.nix

@@ -40,10 +40,6 @@ in {
     inherit config pkgs;
   };
 
-  keychain = import ./programs/keychain.nix {
-    inherit config pkgs ownLib;
-  };
-
   gpg = import ./programs/gpg.nix {
     inherit config;
   };

home/programs/keychain.nix

@@ -1,10 +0,0 @@
-{ config, pkgs, ownLib }:
-
-{
-  enable = true;
-  keys = if ownLib.onHikari {} then ["id_ed25519"] else ["id_rsa" "id_ed25519"];
-  enableBashIntegration = false;
-  enableFishIntegration = false;
-  enableZshIntegration = true;
-  enableXsessionIntegration = false;
-}

home/programs/ssh.nix

@@ -1,10 +1,6 @@
 _:
 
-let
-  oldKey = "~/.ssh/id_rsa";
-  newKey = "~/.ssh/id_ed25519";
-
-in {
+{
   enable = true;
   matchBlocks = {
 
@@ -17,10 +13,7 @@ in {
     "github.com" = {
         user = "git";
         hostname = "github.com";
-        identityFile = "${newKey}";
     };
 
-  } // import ./ssh-match-blocks.nix {
-    inherit oldKey newKey;
-  };
+  } // import ./ssh-match-blocks.nix { };
 }