ci: use official Swift installer with explicit dir in Windows spike

Author: yashranaway

.github/workflows/windows-spike.yml

@@ -21,25 +21,16 @@ jobs:
       - name: Install Swift toolchain
         shell: pwsh
         run: |
-          winget install --id Swift.Toolchain -e --source winget `
-            --accept-source-agreements --accept-package-agreements
-          $candidates = @(
-            (Join-Path $env:LOCALAPPDATA 'Programs\Swift\bin'),
-            'C:\Swift\bin',
-            (Join-Path $env:LOCALAPPDATA 'Microsoft\WinGet\Packages')
-          )
-          $swiftBin = $null
-          foreach ($c in $candidates) {
-            if (Test-Path (Join-Path $c 'swift.exe')) { $swiftBin = $c; break }
+          $url = 'https://download.swift.org/swift-6.3.3-release/windows10/swift-6.3.3-RELEASE/swift-6.3.3-RELEASE-windows10.exe'
+          Invoke-WebRequest $url -OutFile swift-installer.exe
+          Start-Process .\swift-installer.exe -ArgumentList '/VERYSILENT','/SUPPRESSMSGBOXES','/DIR=C:\Swift' -Wait
+          if (-not (Test-Path 'C:\Swift\bin\swift.exe')) {
+            Get-ChildItem 'C:\Swift' -Recurse -Filter '*.exe' -ErrorAction SilentlyContinue |
+              Select-Object -First 20 -ExpandProperty FullName
+            throw 'swift.exe not at C:\Swift\bin after silent install'
           }
-          if (-not $swiftBin) {
-            $found = Get-ChildItem $env:LOCALAPPDATA,'C:\' -Recurse -Filter 'swift.exe' `
-              -ErrorAction SilentlyContinue -Depth 5 | Select-Object -First 1
-            if ($found) { $swiftBin = $found.DirectoryName }
-          }
-          if (-not $swiftBin) { throw 'swift.exe not found after winget install' }
-          Write-Host "Found swift at: $swiftBin"
-          Add-Content $env:GITHUB_PATH $swiftBin
+          Add-Content $env:GITHUB_PATH 'C:\Swift\bin'
+          Add-Content $env:GITHUB_PATH 'C:\Swift\usr\bin'
 
       - name: Set up MSVC environment
         uses: ilammy/msvc-dev-cmd@v1