build: add support for downstream project in some prepare tasks.

pkg/prebuild/cli/cli.go

@@ -139,8 +139,11 @@ func Configure() {
 			builder.Register("stacked-dbus")
 
 		} else {
+			if !prebuild.DownStream {
+				prepare.Register("attach")
+			}
 			builder.Register("attach")
-			prepare.Register("attach")
+
 		}
 
 	default:

pkg/prebuild/directories.go

@@ -13,6 +13,9 @@ var (
 	// AppArmor version
 	Version = 4.0
 
+	// Tells the build we are a downstream project using apparmor.d as dependency
+	DownStream = false
+
 	// Either or not RBAC is enabled
 	RBAC = false