fix args merge

Author: nammn

pipeline.py

@@ -1171,11 +1171,11 @@ def build_multi_arch_agent_in_sonar(
     ecr_registry = os.environ.get("REGISTRY", "268558157000.dkr.ecr.us-east-1.amazonaws.com/dev")
     ecr_agent_registry = ecr_registry + f"/mongodb-agent-ubi"
     quay_agent_registry = QUAY_REGISTRY_URL + f"/mongodb-agent-ubi"
-    joined_args = [arch_amd]
+    joined_args = [args | arch_amd]
 
     # Only include arm64 if we shouldn't skip it
     if not should_skip_arm64():
-        joined_args.append(arch_arm)
+        joined_args.append(args | arch_arm)
 
     build_image_generic(
         config=build_configuration,