feat: update test-arm64 job to use correct runner for arm64 architecture

Author: alexjustesen

.github/workflows/test-build.yml

@@ -35,7 +35,7 @@ jobs:
           cache-to: type=gha,mode=max,scope=test-amd64
 
   test-arm64:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-24.04-arm64
     permissions:
       contents: read