feat(ci): enhance download process in release workflow with multiple URLs

- Updated the release workflow to support multiple download URLs for packages, improving reliability in fetching dependencies.
- Implemented a fallback mechanism to attempt downloads from alternative sources if the primary URL fails, enhancing robustness.
- Added logic to check for the presence of `pkg-config.exe` in multiple candidate directories, ensuring better integration with system binaries.

Benefits:
- Increases the likelihood of successful downloads, reducing build failures due to unavailable resources.
- Streamlines the CI process by ensuring necessary tools are available, improving overall build environment setup.

.github/workflows/release.yml

@@ -210,18 +210,44 @@ jobs:
           $downloads = Join-Path "${{ github.workspace }}" "vcpkg/downloads"
           New-Item -ItemType Directory -Force -Path $downloads | Out-Null
           $packages = @(
-            @{ Name = "msys2-runtime-3.4.10-4-x86_64.pkg.tar.zst"; Url = "https://github.com/msys2/MSYS2-packages/releases/download/msys2-runtime-3.4.10-4/msys2-runtime-3.4.10-4-x86_64.pkg.tar.zst" },
-            @{ Name = "msys2-runtime-3.4.10-4-x86_64.pkg.tar.zst.sig"; Url = "https://github.com/msys2/MSYS2-packages/releases/download/msys2-runtime-3.4.10-4/msys2-runtime-3.4.10-4-x86_64.pkg.tar.zst.sig" }
+            @{ Name = "msys2-runtime-3.4.10-4-x86_64.pkg.tar.zst"; Urls = @(
+                "https://mirror.msys2.org/msys/x86_64/msys2-runtime-3.4.10-4-x86_64.pkg.tar.zst",
+                "https://github.com/msys2/MSYS2-packages/releases/download/msys2-runtime-3.4.10-4/msys2-runtime-3.4.10-4-x86_64.pkg.tar.zst"
+              ) },
+            @{ Name = "msys2-runtime-3.4.10-4-x86_64.pkg.tar.zst.sig"; Urls = @(
+                "https://mirror.msys2.org/msys/x86_64/msys2-runtime-3.4.10-4-x86_64.pkg.tar.zst.sig",
+                "https://github.com/msys2/MSYS2-packages/releases/download/msys2-runtime-3.4.10-4/msys2-runtime-3.4.10-4-x86_64.pkg.tar.zst.sig"
+              ) }
           )
           foreach ($pkg in $packages) {
             $destination = Join-Path $downloads $pkg.Name
             if (-not (Test-Path $destination)) {
-              Write-Host "Downloading $($pkg.Name)"
-              try {
-                Invoke-WebRequest -Uri $pkg.Url -OutFile $destination -Headers @{ "Accept" = "application/octet-stream" }
-              } catch {
-                Write-Host "Invoke-WebRequest failed, retrying with curl.exe"
-                & curl.exe -L $pkg.Url -o $destination
+              $downloaded = $false
+              foreach ($url in $pkg.Urls) {
+                Write-Host "Attempting download of $($pkg.Name) from $url"
+                try {
+                  Invoke-WebRequest -Uri $url -OutFile $destination -Headers @{ "Accept" = "application/octet-stream" }
+                  $downloaded = $true
+                  break
+                } catch {
+                  Write-Host "Invoke-WebRequest failed for $url"
+                }
+              }
+              if (-not $downloaded) {
+                Write-Host "Falling back to curl for $($pkg.Name)"
+                foreach ($url in $pkg.Urls) {
+                  try {
+                    & curl.exe -L $url -o $destination
+                    $downloaded = $true
+                    break
+                  } catch {
+                    Write-Host "curl.exe failed for $url"
+                  }
+                }
+              }
+              if (-not $downloaded) {
+                Write-Host "::error::Unable to download $($pkg.Name) from any mirror"
+                exit 1
               }
             } else {
               Write-Host "$($pkg.Name) already present, skipping download"
@@ -331,12 +357,27 @@ jobs:
         if: runner.os == 'Windows'
         shell: pwsh
         run: |
-          $pkgPath = 'C:\msys64\usr\bin'
-          if (Test-Path $pkgPath) {
-            $pkgPath | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
-            Write-Host "Added $pkgPath to PATH"
-          } else {
-            Write-Host "::warning::pkg-config not found at $pkgPath"
+          $candidateDirs = @(
+            'C:\msys64\usr\bin',
+            (Join-Path "${{ github.workspace }}" 'vcpkg/downloads/tools')
+          )
+
+          $added = $false
+          foreach ($dir in $candidateDirs) {
+            if (-not (Test-Path $dir)) { continue }
+
+            $pkg = Get-ChildItem -Path $dir -Recurse -Filter 'pkg-config.exe' -ErrorAction SilentlyContinue | Select-Object -First 1
+            if ($pkg) {
+              $pkgDir = $pkg.Directory.FullName
+              $pkgDir | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+              Write-Host "Added $pkgDir to PATH"
+              $added = $true
+              break
+            }
+          }
+
+          if (-not $added) {
+            Write-Host "::warning::pkg-config.exe not located; vcpkg may retry its own acquisition."
           }
 
       - name: "Free Disk Space (Linux)"