chore: nix typos and deprecations

CONTRIBUTING.md

@@ -370,7 +370,7 @@ requirements for macOS are detailed below.
 ### Linux
 
 1. Check out the Ghostty source and change to the directory.
-2. Run `nix run .#check.<system>.<test-name>.driver`. `<system>` should be
+2. Run `nix run .#checks.<system>.<test-name>.driver`. `<system>` should be
    `x86_64-linux` or `aarch64-linux` (even on macOS, this launches a Linux
    VM, not a macOS one). `<test-name>` should be one of the tests defined in
    `nix/tests.nix`. The test will build and then launch. Depending on the speed

flake.nix

@@ -64,8 +64,8 @@
     forAllPlatforms = f: lib.genAttrs platforms (s: f legacyPackages.${s});
     forBuildablePlatforms = f: lib.genAttrs buildablePlatforms (s: f legacyPackages.${s});
   in {
-    devShell = forAllPlatforms (pkgs:
-      pkgs.callPackage ./nix/devShell.nix {
+    devShells = forAllPlatforms (pkgs: {
+      default = pkgs.callPackage ./nix/devShell.nix {
         zig = zig.packages.${pkgs.stdenv.hostPlatform.system}."0.15.2";
         wraptest = pkgs.callPackage ./nix/pkgs/wraptest.nix {};
         zon2nix = zon2nix;
@@ -77,7 +77,8 @@
             ucs-detect = pyfinal.callPackage ./nix/pkgs/ucs-detect.nix {};
           };
         };
-      });
+      };
+    });
 
     packages =
       forAllPlatforms (pkgs: {

nix/tests.nix

@@ -91,6 +91,7 @@
           };
           programs.ssh = {
             enable = true;
+            enableDefaultConfig = false;
             extraOptionOverrides = {
               StrictHostKeyChecking = "accept-new";
               UserKnownHostsFile = "/dev/null";