Specify that container job must run on linux

Author: gabrielfeo

.github/workflows/sample-gradle-project.yml

@@ -22,7 +22,7 @@ jobs:
         working-directory: sample-gradle-project
 
   with-setup-gradle-and-container:
-    runs-on: self-hosted
+    runs-on: [self-hosted, linux]
     container:
       image: arm64v8/eclipse-temurin:23-jdk-alpine
     steps: