[glib: 4/6] ci: Document access token permissions needed for uploading images

[Sebastian Dröge <sdroege src gnome org>]

commit 57ed9098575b039af262152343139fe2ea22f4b1
Author: Philip Withnall <withnall endlessm com>
Date:   Thu May 14 16:26:12 2020 +0100

    ci: Document access token permissions needed for uploading images
    
    New, finer-grained permissions are now supported in GitLab.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>

 .gitlab-ci/README.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci/README.md b/.gitlab-ci/README.md
index 6c128796e..f56cbbd49 100644
--- a/.gitlab-ci/README.md
+++ b/.gitlab-ci/README.md
@@ -15,7 +15,8 @@ GitLab CI jobs run in a Docker image, defined here. To update that image
       registry
     * If you use 2-factor authentication on your GNOME GitLab account, you'll
       need to [create a personal access token][pat] and use that rather than
-      your normal password
+      your normal password — the token should have `read_registry` and
+      `write_registry` permissions
 1. Edit `.gitlab-ci.yml` (in the root of this repository) to use your new
    image