Merge branch 'new-docs-linting-image' into 'master'

Change image for docs linting

See merge request gitlab-org/gitlab-ce!22100

.gitlab-ci.yml

@@ -606,7 +606,7 @@ static-analysis:
 docs lint:
   <<: *dedicated-runner
   <<: *except-qa
-  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:nanoc-bootstrap-ruby-2.4-alpine"
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:gitlab-docs-lint"
   stage: test
   cache: {}
   dependencies: []
@@ -614,8 +614,8 @@ docs lint:
   script:
     - scripts/lint-doc.sh
     - scripts/lint-changelog-yaml
-    - mv doc/ /nanoc/content/
-    - cd /nanoc
+    - mv doc/ /tmp/gitlab-docs/content/
+    - cd /tmp/gitlab-docs
     # Build HTML from Markdown
     - bundle exec nanoc
     # Check the internal links