style: Apply nixfmt to trivial Nix files

ALl the ones except for build-image.nix are considered trivial. On the
latter, nixfmt makes some useful changes but by-and-large it is not
ready for that code yet.

tools/nixery/build-image/go-deps.nix

@@ -1,6 +1,5 @@
 # This file was generated by https://github.com/kamilchm/go2nix v1.3.0
-[
-  {
+[{
   goPackagePath = "gonum.org/v1/gonum";
   fetch = {
     type = "git";
@@ -8,5 +7,4 @@
     rev = "ced62fe5104b907b6c16cb7e575c17b2e62ceddd";
     sha256 = "1b7q6haabnp53igpmvr6a2414yralhbrldixx4kbxxg1apy8jdjg";
   };
-  }
-]
+}]

tools/nixery/default.nix

@@ -11,8 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-{ pkgs ? import <nixpkgs> {}
-, preLaunch ? "" }:
+{ pkgs ? import <nixpkgs> { }, preLaunch ? "" }:
 
 with pkgs;
 
@@ -23,7 +22,7 @@ rec {
   # Users will usually not want to use this directly, instead see the
   # 'nixery' derivation below, which automatically includes runtime
   # data dependencies.
-  nixery-server = callPackage ./server {};
+  nixery-server = callPackage ./server { };
 
   # Implementation of the image building & layering logic
   nixery-build-image = (import ./build-image { inherit pkgs; }).wrapper;
@@ -31,7 +30,7 @@ rec {
   # Use mdBook to build a static asset page which Nixery can then
   # serve. This is primarily used for the public instance at
   # nixery.dev.
-  nixery-book = callPackage ./docs {};
+  nixery-book = callPackage ./docs { };
 
   # Wrapper script running the Nixery server with the above two data
   # dependencies configured.
@@ -76,7 +75,7 @@ rec {
     '';
   in dockerTools.buildLayeredImage {
     name = "nixery";
-    config.Cmd = ["${nixery-launch-script}/bin/nixery"];
+    config.Cmd = [ "${nixery-launch-script}/bin/nixery" ];
     maxLayers = 96;
     contents = [
       cacert

tools/nixery/docs/default.nix

@@ -45,7 +45,7 @@ let
     rev = "3cd0f7d7b4f487d04a3f1e3ca8f2eb1ab958c49b";
     sha256 = "02lpda03q580gyspkbmlgnb2cbm66rrcgqsv99aihpbwyjym81af";
   };
-in runCommand "nixery-book" {} ''
+in runCommand "nixery-book" { } ''
   mkdir -p $out
   cp -r ${./.}/* .
   chmod -R a+w src

tools/nixery/shell.nix

@@ -14,14 +14,11 @@
 
 # Configures a shell environment that builds required local packages to
 # run Nixery.
-{pkgs ? import <nixpkgs> {} }:
+{ pkgs ? import <nixpkgs> { } }:
 
 let nixery = import ./default.nix { inherit pkgs; };
 in pkgs.stdenv.mkDerivation {
   name = "nixery-dev-shell";
 
-  buildInputs = with pkgs;[
-    jq
-    nixery.nixery-build-image
-  ];
+  buildInputs = with pkgs; [ jq nixery.nixery-build-image ];
 }