update self-hosted to qemu-specific runner (#57)

Author: rmalmain

.github/workflows/build_and_test.yaml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: self-hosted
+    runs-on: [self-hosted, qemu]
     container: registry.gitlab.com/qemu-project/qemu/qemu/ubuntu2204:latest
     steps:
       - uses: actions/checkout@v4