[NixOS] Fix warnings

nixos/home-manager.nix

@@ -11,7 +11,22 @@
   programs.home-manager.enable = true;
 
   programs.ssh = {
-    forwardAgent = true;
+    enable = true;
+    enableDefaultConfig = false;
+    matchBlocks = {
+      "*" = {
+        forwardAgent = true;
+        addKeysToAgent = "no";
+        compression = false;
+        serverAliveInterval = 0;
+        serverAliveCountMax = 3;
+        hashKnownHosts = false;
+        userKnownHostsFile = "~/.ssh/known_hosts";
+        controlMaster = "no";
+        controlPath = "~/.ssh/master-%r@%n:%p";
+        controlPersist = "no";
+      };
+    };
   };
 
   services.gpg-agent = {