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

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

.gitlab/ci/memory.gitlab-ci.yml

+# Make sure to update all the similar conditions in other CI config files if you modify these conditions
+.if-default-refs: &if-default-refs
+  if: '$CI_COMMIT_REF_NAME == "master" || $CI_COMMIT_REF_NAME =~ /^[\d-]+-stable(-ee)?$/ || $CI_COMMIT_REF_NAME =~ /^\d+-\d+-auto-deploy-\d+$/ || $CI_COMMIT_REF_NAME =~ /^security\// || $CI_MERGE_REQUEST_IID || $CI_COMMIT_TAG'
+
+# Make sure to update all the similar patterns in other CI config files if you modify these patterns
+.code-patterns: &code-patterns
+  - ".gitlab/ci/**/*"
+  - ".{eslintignore,gitattributes,nvmrc,prettierrc,stylelintrc,yamllint}"
+  - ".{codeclimate,eslintrc,gitlab-ci,haml-lint,haml-lint_todo,rubocop,rubocop_todo,scss-lint}.yml"
+  - ".csscomb.json"
+  - "Dockerfile.assets"
+  - "*_VERSION"
+  - "Gemfile{,.lock}"
+  - "Rakefile"
+  - "{babel.config,jest.config}.js"
+  - "config.ru"
+  - "{package.json,yarn.lock}"
+  - "{,ee/}{app,bin,config,db,haml_lint,lib,locale,public,scripts,symbol,vendor}/**/*"
+  - "doc/api/graphql/reference/*" # Files in this folder are auto-generated
+
 .only-code-memory-job-base:
   extends:
     - .default-tags
     - .default-retry
     - .default-cache
-    - .default-only
     - .default-before_script
-    - .only:changes-code
+  rules:
+    - <<: *if-default-refs
+      changes: *code-patterns
+      when: on_success
 
 memory-static:
   extends: .only-code-memory-job-base