ci(gitlab-ci): ignore line to avoid `yamllint` violation [skip ci]

.gitlab-ci.yml

@@ -19,6 +19,7 @@
     name: 'myii/ssf-pre-commit:2.9.2'
     entrypoint: ['/bin/bash', '-c']
   image_rubocop: &image_rubocop 'pipelinecomponents/rubocop:latest'
+  # yamllint disable-line rule:line-length
   image_semantic-release: &image_semanticrelease 'myii/ssf-semantic-release-pandoc:15.14'
   # `services`
   services_docker_dind: &services_docker_dind