Fix a test-selection gap

This was detected in
https://gitlab.com/gitlab-org/quality/engineering-productivity/master-broken-incidents/-/issues/176#note_1176271397



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

.gitlab/ci/rules.gitlab-ci.yml

@@ -312,6 +312,7 @@
   - "scripts/rspec_helpers.sh"
   # Mapped patterns (see tests.yml)
   - "data/whats_new/*.yml"
+  - "doc/index.md"
 
 .search-backend-patterns: &search-backend-patterns
   - "{,jh/}Gemfile.lock"
@@ -381,6 +382,7 @@
   - ".gitlab/ci/**/*"
   # Mapped patterns (see tests.yml)
   - "data/whats_new/*.yml"
+  - "doc/index.md"
 
 # .code-patterns + .backstage-patterns
 .code-backstage-patterns: &code-backstage-patterns
@@ -411,6 +413,7 @@
   - "{,spec/}tooling/**/*"
   # Mapped patterns (see tests.yml)
   - "data/whats_new/*.yml"
+  - "doc/index.md"
 
 # .code-patterns + .qa-patterns
 .code-qa-patterns: &code-qa-patterns
@@ -437,6 +440,7 @@
   - "{,jh/}qa/**/*"
   # Mapped patterns (see tests.yml)
   - "data/whats_new/*.yml"
+  - "doc/index.md"
 
 # .code-patterns + .backstage-patterns + .qa-patterns
 .code-backstage-qa-patterns: &code-backstage-qa-patterns
@@ -471,6 +475,7 @@
   - "{,jh/}qa/**/*"
   # Mapped patterns (see tests.yml)
   - "data/whats_new/*.yml"
+  - "doc/index.md"
 
 # .code-backstage-qa-patterns + .workhorse-patterns
 # NOTE: `setup-test-env-patterns` intentionally does not include docs files, because this would
@@ -493,7 +498,9 @@
   - "config.ru"
   - "{,ee/,jh/}{app,bin,config,db,generator_templates,haml_lint,lib,locale,public,scripts,storybook,symbol,vendor}/**/*"
   - "doc/api/graphql/reference/*"  # Files in this folder are auto-generated
+  # Mapped patterns (see tests.yml)
   - "data/whats_new/*.yml"
+  - "doc/index.md"
   # CI changes
   - ".gitlab-ci.yml"
   - ".gitlab/ci/**/*"

tests.yml

@@ -61,6 +61,10 @@ mapping:
   - source: data/whats_new/\w*.yml
     test: spec/lib/release_highlights/validator_spec.rb
 
+  # The documentation index page is used in this haml_lint spec
+  - source: doc/index.md
+    test: spec/haml_lint/linter/documentation_links_spec.rb
+
   - source: (ee/)?app/workers/.+\.rb
     test: spec/workers/every_sidekiq_worker_spec.rb