Fix release script check

.gitlab/scripts/release.sh

@@ -13,7 +13,7 @@ if [ -z "${GITLAB_TOKEN}" ]; then
   exit 1
 fi
 
-if [ "main" = "$(git rev-parse --abbrev-ref HEAD)" ]; then
+if [ "main" != "$(git rev-parse --abbrev-ref HEAD)" ]; then
   echo "Error: please checkout the main branch first: git checkout main." >&2
   exit 1
 fi