Fix get release draft permission check (#36659)

Draft release and it's attachments need a write permission to access.

---------

Signed-off-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Giteabot <teabot@gitea.io>

models/fixtures/attachment.yml

@@ -153,3 +153,16 @@
   download_count: 0
   size: 0
   created_unix: 946684800
+
+-
+  id: 13
+  uuid: a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a23
+  repo_id: 1
+  issue_id: 0
+  release_id: 4
+  uploader_id: 2
+  comment_id: 0
+  name: draft-attach
+  download_count: 0
+  size: 0
+  created_unix: 946684800