test(e2e): use patched vite for portable build cache (#496)

## Motivation

The portable Vite build cache e2e should exercise the default `vite
build` path, not the `--configLoader runner` workaround.

This PR uses a pnpm patch for `vite@8.1.0` that includes the bundled
config temp-dir fix from vitejs/vite#22800. With
that patch in place, the fixture can run plain `vite build` and still
verify that a copied task cache is reused after restore.

Co-authored-by: GPT-5 Codex <codex@openai.com>

Author: wan9chi

crates/vite_task_bin/tests/e2e_snapshots/fixtures/vite_build_cache/portable_clone/vite-task.json

@@ -1,8 +1,7 @@
 {
   "tasks": {
     "build": {
-      // TODO: --configLoader runner works around a Vite config-loader bug that makes this cache non-portable.
-      "command": "vite build --configLoader runner",
+      "command": "vite build",
       "cache": true
     }
   }

crates/vite_task_bin/tests/e2e_snapshots/fixtures/vite_build_cache/portable_origin/vite-task.json

@@ -1,8 +1,7 @@
 {
   "tasks": {
     "build": {
-      // TODO: --configLoader runner works around a Vite config-loader bug that makes this cache non-portable.
-      "command": "vite build --configLoader runner",
+      "command": "vite build",
       "cache": true
     }
   }

crates/vite_task_bin/tests/e2e_snapshots/fixtures/vite_build_cache/snapshots/vite_build_cache_is_portable_across_workspace_roots.md

@@ -7,7 +7,7 @@ Two identical plain Vite workspaces run from different absolute roots. The test
 origin workspace root: cache miss populates its default cache
 
 ```
-$ vite build --configLoader runner
+$ vite build
 ```
 
 ## `cd portable_origin && vtt stat-file dist/assets/index.js`
@@ -30,7 +30,7 @@ copy-paste the cache directory to simulate upload/download
 clone workspace root: cache hit from the origin root
 
 ```
-$ vite build --configLoader runner ◉ cache hit, replaying
+$ vite build ◉ cache hit, replaying
 
 ---
 vt run: cache hit.

patches/vite@8.1.0.patch

@@ -0,0 +1,31 @@
+diff --git a/dist/node/chunks/node.js b/dist/node/chunks/node.js
+index 8d6dbaf1f21914bcf02576f8a5f13546a3dcdce8..49b30abd781d906c2cbc47e6c035f00f70b26554 100644
+--- a/dist/node/chunks/node.js
++++ b/dist/node/chunks/node.js
+@@ -35651,17 +35651,19 @@ const _require = createRequire(
+ );
+ async function loadConfigFromBundledFile(fileName, bundledCode, isESM) {
+ 	if (isESM) {
+-		let nodeModulesDir = typeof process.versions.deno === "string" ? void 0 : findNearestNodeModules(path.dirname(fileName));
+-		if (nodeModulesDir) try {
+-			await fsp.mkdir(path.resolve(nodeModulesDir, ".vite-temp/"), { recursive: true });
++		const nodeModulesDir = typeof process.versions.deno === "string" ? void 0 : findNearestNodeModules(path.dirname(fileName));
++		let viteTempDir = nodeModulesDir ? path.resolve(nodeModulesDir, ".vite-temp") : void 0;
++		if (viteTempDir) try {
++			await fsp.mkdir(viteTempDir, { recursive: true });
+ 		} catch (e) {
+-			if (e.code === "EACCES") nodeModulesDir = void 0;
++			if (e.code === "EACCES") viteTempDir = void 0;
+ 			else throw e;
+ 		}
+ 		const hash = `timestamp-${Date.now()}-${Math.random().toString(16).slice(2)}`;
+-		const tempFileName = nodeModulesDir ? path.resolve(nodeModulesDir, `.vite-temp/${path.basename(fileName)}.${hash}.mjs`) : `${fileName}.${hash}.mjs`;
+-		ignoreInput(tempFileName);
+-		ignoreOutput(tempFileName);
++		const tempFileName = viteTempDir ? path.resolve(viteTempDir, `${path.basename(fileName)}.${hash}.mjs`) : `${fileName}.${hash}.mjs`;
++		const pathToIgnore = viteTempDir ?? tempFileName;
++		ignoreInput(pathToIgnore);
++		ignoreOutput(pathToIgnore);
+ 		await fsp.writeFile(tempFileName, bundledCode);
+ 		try {
+ 			return (await import(pathToFileURL(tempFileName).href)).default;

pnpm-lock.yaml

@@ -24,6 +24,8 @@ overrides:
   # override above routes vite to the Vite+ toolchain fork, which does not carry
   # the integration — so scope vite-task-tools' `vite` to a real upstream build.
   vite-task-tools>vite: ^8.1.0
+patchedDependencies:
+  vite@8.1.0: patches/vite@8.1.0.patch
 peerDependencyRules:
   allowAny:
     - vite