https://docs.gitlab.com/ee/ci/yaml/includes.html#re-using-a-before_script-temp...

https://docs.gitlab.com/ee/ci/yaml/includes.html#re-using-a-before_script-template uses `before_script` at top level.

As of three months ago (https://gitlab.com/gitlab-org/gitlab/-/commit/9c8bb8144936c860e7ec9c06af7e17504acaaa40), this appears to be deprecated: https://docs.gitlab.com/ee/ci/yaml/#globally-defined-image-services-cache-before_script-after_script

The default keyword was created to avoid having `before_script` at the top level: https://gitlab.com/gitlab-org/gitlab-foss/-/issues/62732

doc/ci/yaml/includes.md

@@ -73,10 +73,11 @@ automatically fetched and evaluated along with the content of `.gitlab-ci.yml`.
 Content of `https://gitlab.com/awesome-project/raw/master/.before-script-template.yml`:
 
 ```yaml
-before_script:
-  - apt-get update -qq && apt-get install -y -qq sqlite3 libsqlite3-dev nodejs
-  - gem install bundler --no-document
-  - bundle install --jobs $(nproc)  "${FLAGS[@]}"
+default:
+  before_script:
+    - apt-get update -qq && apt-get install -y -qq sqlite3 libsqlite3-dev nodejs
+    - gem install bundler --no-document
+    - bundle install --jobs $(nproc)  "${FLAGS[@]}"
 ```
 
 Content of `.gitlab-ci.yml`: