Find installed PowerShell on Windows runner

.gitea/workflows/ci.yml

@@ -57,6 +57,15 @@ jobs:
     runs-on: windows-latest
     steps:
       - uses: actions/checkout@v5
+      - name: Find PowerShell 7 on Windows runner
+        shell: powershell
+        run: |
+          $pwsh = (Get-Command pwsh -ErrorAction SilentlyContinue | Select-Object -First 1).Source
+          if (-not $pwsh) { $pwsh = Join-Path $env:ProgramFiles 'PowerShell\7\pwsh.exe' }
+          if (-not (Test-Path $pwsh)) { throw "PowerShell 7 is not available to the runner at $pwsh" }
+          $version = & $pwsh -NoProfile -Command '$PSVersionTable.PSVersion.ToString()'
+          Write-Host "Using PowerShell $version at $pwsh"
+          Add-Content -Path $env:GITEA_PATH -Value (Split-Path $pwsh)
       - name: Verify Windows runner
         shell: pwsh
         run: |