Update Build-self-hosted.yml

Author: josef-poetzl

.github/workflows/Build-self-hosted.yml

@@ -8,7 +8,7 @@ permissions:
 
 jobs:
   build:
-    runs-on: self-hosted
+    runs-on: [self-hosted]
     steps:
       - name: "Checkout"
         uses: actions/checkout@v4