treewide: Fix PACKAGE_DIRECTORY_MATCH rule exception

Change-Id: I8c4061f8d147a4708167b0674abfa23784a7f40d
Reviewed-on: https://review.monogon.dev/c/monogon/+/3801
Tested-by: Jenkins CI
Reviewed-by: Leopold Schabel <leo@monogon.tech>
diff --git a/build/static_binary_tarball/spec/spec.proto b/build/static_binary_tarball/spec/spec.proto
index b47d137..8e758d7 100644
--- a/build/static_binary_tarball/spec/spec.proto
+++ b/build/static_binary_tarball/spec/spec.proto
@@ -16,7 +16,7 @@
 
 syntax = "proto3";
 
-package spec;
+package build.static_binary_tarball.spec;
 
 // Spec is a spec of what goes into a static_binary_tarball
 message Spec {