Give Windows arm64 tests enough CI time

Let the Windows arm64 test matrix use a longer timeout after CI showed the lane spending most of the default 45 minutes compiling before nextest could finish. Restore a guarded Dev Drive VHD provisioning attempt for GitHub-hosted runners that no longer expose D:, while preserving the C: fallback when provisioning is unavailable.

Also pin nextest through taiki-e/install-action's supported tool version syntax so the requested version is not ignored.

Co-authored-by: Codex <noreply@openai.com>

.github/scripts/setup-dev-drive.ps1

@@ -1,14 +1,55 @@
 # Configure a fast drive for Windows CI jobs.
 #
-# If the runner already exposes `D:`, prefer it directly. Otherwise fall back
-# to `C:` without trying to provision a new volume in CI.
+# GitHub-hosted Windows runners do not always expose a secondary D: volume. When
+# they do not, try to create a Dev Drive VHD and fall back to C: if the runner
+# image does not allow that provisioning path.
+
+function Use-FallbackDrive {
+    param([string]$Reason)
+
+    Write-Warning "$Reason Falling back to C:"
+    return "C:"
+}
+
+function Invoke-BestEffort {
+    param([scriptblock]$Script, [string]$Description)
+
+    try {
+        & $Script
+    } catch {
+        Write-Warning "$Description failed: $($_.Exception.Message)"
+    }
+}
 
 if (Test-Path "D:\") {
     Write-Output "Using existing drive at D:"
     $Drive = "D:"
 } else {
-    Write-Warning "No D: drive available; falling back to C:"
-    $Drive = "C:"
+    try {
+        $VhdPath = Join-Path $env:RUNNER_TEMP "codex-dev-drive.vhdx"
+        $SizeBytes = 64GB
+
+        if (Test-Path $VhdPath) {
+            Remove-Item -Path $VhdPath -Force
+        }
+
+        New-VHD -Path $VhdPath -SizeBytes $SizeBytes -Dynamic -ErrorAction Stop | Out-Null
+        $Mounted = Mount-VHD -Path $VhdPath -Passthru -ErrorAction Stop
+        $Disk = $Mounted | Get-Disk -ErrorAction Stop
+        $Disk | Initialize-Disk -PartitionStyle GPT -ErrorAction Stop
+        $Partition = $Disk | New-Partition -AssignDriveLetter -UseMaximumSize -ErrorAction Stop
+        $Volume = $Partition | Format-Volume -FileSystem ReFS -NewFileSystemLabel "CodexDevDrive" -DevDrive -Confirm:$false -Force -ErrorAction Stop
+
+        $Drive = "$($Volume.DriveLetter):"
+
+        Invoke-BestEffort { fsutil devdrv trust $Drive } "Trusting Dev Drive $Drive"
+        Invoke-BestEffort { fsutil devdrv enable /disallowAv } "Disabling AV filter attachment for Dev Drives"
+        Invoke-BestEffort { fsutil devdrv query $Drive } "Querying Dev Drive $Drive"
+
+        Write-Output "Using Dev Drive at $Drive"
+    } catch {
+        $Drive = Use-FallbackDrive "Failed to create Dev Drive: $($_.Exception.Message)"
+    }
 }
 
 $Tmp = "$Drive\codex-tmp"