[Remote Bazel] Fix missing user platform prop

enterprise/server/hostedrunner/hostedrunner.go

@@ -184,6 +184,7 @@ func (r *runnerService) createAction(ctx context.Context, req *rnpb.RunRequest,
 				{Name: "workload-isolation-type", Value: "firecracker"},
 				{Name: platform.EstimatedComputeUnitsPropertyName, Value: "2"},
 				{Name: platform.EstimatedFreeDiskPropertyName, Value: "20000000000"}, // 20GB
+				{Name: platform.DockerUserPropertyName, Value: user},
 			},
 		},
 	}