Use 'rules' in '.gitlab/ci/releases.gitlab-ci.yml'

Signed-off-by: Rémy Coutable <remy@rymai.me>

.gitlab-ci.yml

@@ -24,9 +24,6 @@ variables:
   ES_JAVA_OPTS: "-Xms256m -Xmx256m"
   ELASTIC_URL: "http://elastic:changeme@elasticsearch:9200"
 
-after_script:
-  - date
-
 include:
   - local: .gitlab/ci/cache-repo.gitlab-ci.yml
   - local: .gitlab/ci/cng.gitlab-ci.yml

.gitlab/ci/releases.gitlab-ci.yml

----
+.releases:rules:canonical-dot-com-gitlab-stable-branch-only:
+  rules:
+    - if: '$CI_SERVER_HOST == "gitlab.com" && $CI_PROJECT_NAME == "gitlab-org/gitlab" && $CI_COMMIT_REF_NAME =~ /^[\d-]+-stable-ee$/'
+
+.releases:rules:canonical-dot-com-security-gitlab-stable-branch-only:
+  rules:
+    - if: '$CI_SERVER_HOST == "gitlab.com" && $CI_PROJECT_NAME == "gitlab-org/security/gitlab" && $CI_COMMIT_REF_NAME =~ /^[\d-]+-stable-ee$/'
 
 # Syncs any changes pushed to a stable branch to the corresponding
 # gitlab-foss/CE stable branch. We run this prior to any tests so that random
@@ -10,27 +16,21 @@
   stage: sync
   before_script:
     - apk add --no-cache --update curl bash jq
-  after_script: []
   script:
     - bash scripts/sync-stable-branch.sh
-  only:
-    variables:
-      - $CI_SERVER_HOST == "gitlab.com"
 
 sync-stable-branch:
-  extends: .merge-train-sync
+  extends:
+    - .releases:rules:canonical-dot-com-gitlab-stable-branch-only
+    - .merge-train-sync
   variables:
     SOURCE_PROJECT: gitlab-org/gitlab
     TARGET_PROJECT: gitlab-org/gitlab-foss
-  only:
-    refs:
-      - /^[\d-]+-stable-ee$/@gitlab-org/gitlab
 
 sync-security-branch:
-  extends: .merge-train-sync
+  extends:
+    - .releases:rules:canonical-dot-com-security-gitlab-stable-branch-only
+    - .merge-train-sync
   variables:
     SOURCE_PROJECT: gitlab-org/security/gitlab
     TARGET_PROJECT: gitlab-org/security/gitlab-foss
-  only:
-    refs:
-      - /^[\d-]+-stable-ee$/@gitlab-org/security/gitlab