fix The string is missing the terminator

.gitea/workflows/windows.yml

@@ -616,7 +616,7 @@ jobs:
               throw "RUSTDESK_KEY secret is empty"
           }
 
-          @'
+          $pythonCode = @'
           import json
           import os
           import re
@@ -630,6 +630,12 @@ jobs:
           server = os.environ["ID_SERVER"].strip()
           key = os.environ["PUB_KEY"].strip()
 
+          if not server:
+              raise SystemExit("RUSTDESK_ID_SERVER is empty")
+
+          if not key:
+              raise SystemExit("RUSTDESK_KEY is empty")
+
           text = path.read_text(encoding="utf-8")
 
           text, server_count = re.subn(
@@ -663,7 +669,36 @@ jobs:
               )
 
           path.write_text(text, encoding="utf-8")
-          PY
+
+          print(f"ID server configured: {server}")
+          print("Server public key configured successfully")
+          print("Relay configuration untouched")
+          '@
+
+          $pythonCode | python -
+
+          if ($LASTEXITCODE -ne 0) {
+              throw "RustDesk configuration patch failed"
+          }
+
+          Write-Host ""
+          Write-Host "Checking patched RustDesk configuration..."
+
+          $config = Get-Content `
+            "rustdesk\libs\hbb_common\src\config.rs" `
+            -Raw
+
+          if ($config -notmatch "RENDEZVOUS_SERVERS") {
+              throw "RENDEZVOUS_SERVERS not found after patch"
+          }
+
+          if ($config -notmatch "RS_PUB_KEY") {
+              throw "RS_PUB_KEY not found after patch"
+          }
+
+          Write-Host "Custom ID server: OK"
+          Write-Host "Custom public key: OK"
+          Write-Host "Relay untouched: OK"
 
       - name: Install RustDesk vcpkg dependencies
         shell: pwsh