fix: update publish workflow to use environment variable for NuGet API key

Author: chenxizhang

.github/workflows/publishpackage.yml

@@ -114,15 +114,15 @@ jobs:
           # 6. Publish module
           Write-Host "🚀 Publishing module to PowerShell Gallery..." -ForegroundColor Yellow
           try {
-              Publish-Module -Path $ModulePath -NuGetApiKey $nugetkey -Verbose -Force
+              Publish-Module -Path $ModulePath -NuGetApiKey $env:nugetkey -Verbose -Force
               Write-Host "🎉 Module published successfully!" -ForegroundColor Green
               Write-Host "📦 Module link: https://www.powershellgallery.com/packages/$ModuleName" -ForegroundColor Cyan
           }
           catch {
               Write-Error "❌ Module publishing failed: $_"
               Write-Host "📋 Attempting to publish with SkipAutomaticTags..." -ForegroundColor Yellow
               try {
-                  Publish-Module -Path $ModulePath -NuGetApiKey $nugetkey -Verbose -Force -SkipAutomaticTags
+                  Publish-Module -Path $ModulePath -NuGetApiKey $env:nugetkey -Verbose -Force -SkipAutomaticTags
                   Write-Host "🎉 Module published successfully (with SkipAutomaticTags)!" -ForegroundColor Green
                   Write-Host "📦 Module link: https://www.powershellgallery.com/packages/$ModuleName" -ForegroundColor Cyan
               }