Fix missing docker staging DRA artifacts (#39297)

The DRA staging release is failing because the Buildkite step isn't capturing the right artifacts.
This commit fixes the issue by adjusting the artifact_paths to match the other steps.

(cherry picked from commit 85c9d14)

.buildkite/packaging.pipeline.yml

@@ -192,7 +192,7 @@ steps:
           imagePrefix: "${AWS_IMAGE_UBUNTU_ARM_64}"
           instanceType: "${AWS_ARM_INSTANCE_TYPE}"
         artifact_paths:
-          - build/distributions/**
+          - build/distributions/**/*
         matrix:
           - auditbeat
           - filebeat