docs(ci): update release docs

.gitlab-ci.yml

@@ -68,7 +68,7 @@ docker-push:
   services:
     - docker:dind
   script:
-    # every commit on main branch should build and push image as unstable
+    # every commit on main branch builds and pushes the image with labels "main" and "main-{hash}"
     # elseif its a protected branch build and push to gitlab registry
     # else it is from a tag (enforced by gitlab-ci rules)
     # hint: tags are references independent of branches