Exit-1 if invoke-pester created error entries

.github/workflows/ci.yml

@@ -320,12 +320,14 @@ jobs:
 
     - name: Run Pester tests (PowerShell)
       run: |
-        Write-host $PSVersionTable.PSVersion.Major $PSVersionTable.PSRemotingProtocolVersion.Minor
+        $PSVersionTable
         Set-PSRepository psgallery -InstallationPolicy trusted
         Install-Module -Name Pester -RequiredVersion 5.3.1 -Confirm:$false -Force
-
+        $Error.clear()
         Invoke-Pester -Path "tests" -CI
-      shell: pwsh
+        if ($Error.Length -gt 0) {exit 1}
+
+      shell: powershell
 
     - name: Discord notification
       uses: rjstone/discord-webhook-notify@v1