Format .nix files

This does not include any automation for the release branch, but
is based on the configuration of https://github.com/NixOS/nix/pull/12349

    pre-commit run -a nixfmt-rfc-style

tests/unit/libstore/package.nix

@@ -1,26 +1,27 @@
-{ lib
-, buildPackages
-, stdenv
-, mkMesonDerivation
-, releaseTools
+{
+  lib,
+  buildPackages,
+  stdenv,
+  mkMesonDerivation,
+  releaseTools,
 
-, meson
-, ninja
-, pkg-config
+  meson,
+  ninja,
+  pkg-config,
 
-, nix-store
-, nix-store-c
-, nix-store-test-support
-, sqlite
+  nix-store,
+  nix-store-c,
+  nix-store-test-support,
+  sqlite,
 
-, rapidcheck
-, gtest
-, runCommand
+  rapidcheck,
+  gtest,
+  runCommand,
 
-# Configuration Options
+  # Configuration Options
 
-, version
-, filesetToSource
+  version,
+  filesetToSource,
 }:
 
 let
@@ -69,9 +70,12 @@ mkMesonDerivation (finalAttrs: {
   mesonFlags = [
   ];
 
-  env = lib.optionalAttrs (stdenv.isLinux && !(stdenv.hostPlatform.isStatic && stdenv.system == "aarch64-linux")) {
-    LDFLAGS = "-fuse-ld=gold";
-  };
+  env =
+    lib.optionalAttrs
+      (stdenv.isLinux && !(stdenv.hostPlatform.isStatic && stdenv.system == "aarch64-linux"))
+      {
+        LDFLAGS = "-fuse-ld=gold";
+      };
 
   separateDebugInfo = !stdenv.hostPlatform.isStatic;
 
@@ -79,26 +83,33 @@ mkMesonDerivation (finalAttrs: {
 
   passthru = {
     tests = {
-      run = let
-        # Some data is shared with the functional tests: they create it,
-        # we consume it.
-        data = filesetToSource {
-          root = ../..;
-          fileset = lib.fileset.unions [
-            ./data
-            ../../functional/derivation
-          ];
-        };
-      in runCommand "${finalAttrs.pname}-run" {
-        meta.broken = !stdenv.hostPlatform.emulatorAvailable buildPackages;
-      } (lib.optionalString stdenv.hostPlatform.isWindows ''
-        export HOME="$PWD/home-dir"
-        mkdir -p "$HOME"
-      '' + ''
-        export _NIX_TEST_UNIT_DATA=${data + "/unit/libstore/data"}
-        ${stdenv.hostPlatform.emulator buildPackages} ${lib.getExe finalAttrs.finalPackage}
-        touch $out
-      '');
+      run =
+        let
+          # Some data is shared with the functional tests: they create it,
+          # we consume it.
+          data = filesetToSource {
+            root = ../..;
+            fileset = lib.fileset.unions [
+              ./data
+              ../../functional/derivation
+            ];
+          };
+        in
+        runCommand "${finalAttrs.pname}-run"
+          {
+            meta.broken = !stdenv.hostPlatform.emulatorAvailable buildPackages;
+          }
+          (
+            lib.optionalString stdenv.hostPlatform.isWindows ''
+              export HOME="$PWD/home-dir"
+              mkdir -p "$HOME"
+            ''
+            + ''
+              export _NIX_TEST_UNIT_DATA=${data + "/unit/libstore/data"}
+              ${stdenv.hostPlatform.emulator buildPackages} ${lib.getExe finalAttrs.finalPackage}
+              touch $out
+            ''
+          );
     };
   };