Drone: publish-linux-packages should be privileged (#55816) (#56383)

It's currently failing with a failure to mount s3fs

(cherry picked from commit 169df2fe90)

Co-authored-by: Julien Duchesne <julien.duchesne@grafana.com>

scripts/drone/steps/lib.star

@@ -1032,6 +1032,7 @@ def publish_linux_packages_step(edition):
         'depends_on': [
             'gen-version'
         ],
+        'privileged': True,
         'failure': 'ignore', # While we're testing it
         'settings': {
             'access_key_id': from_secret('packages_access_key_id'),