Add manual job for running Banzai benchmarks

The job is called “benchmark-markdown” and is in
the “post-test” stage.

.gitlab-ci.yml

@@ -13,6 +13,7 @@ stages:
   - pages
   - notify
   - release-environments
+  - benchmark
 
 # always use `gitlab-org` runners, however
 # in cases where jobs require Docker-in-Docker, the job

.gitlab/ci/benchmark.gitlab-ci.yml

+benchmark-markdown:
+  extends:
+    - .single-db-ci-connection
+    - .rails-job-base
+    - .use-pg14
+    - .benchmark:rules:benchmark-markdown
+  stage: benchmark
+  needs:
+    - setup-test-env
+  script:
+    - section_start "gitaly-test-spawn" "Spawning Gitaly"; scripts/gitaly-test-spawn; section_end "gitaly-test-spawn";  # Do not use 'bundle exec' here
+    - bundle exec rake benchmark:banzai &> benchmark-markdown.txt
+  artifacts:
+    when: always
+    paths:
+      - benchmark-markdown.txt
+  allow_failure: true

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

@@ -2473,9 +2473,9 @@
         - ".gitlab/ci/test-metadata.gitlab-ci.yml"
         - "scripts/rspec_helpers.sh"
 
-#######################
+###################
 # Preflight rules #
-#######################
+###################
 
 .preflight:rules:rails-production-server-boot:
   rules:
@@ -2605,3 +2605,14 @@
     - <<: *if-merge-request-labels-pipeline-expedite
       when: never
     - !reference [".releases:rules:canonical-dot-com-gitlab-stable-branch-only-setup-test-env-patterns", rules]
+
+###################
+# Benchmark rules #
+###################
+.benchmark:rules:benchmark-markdown:
+  rules:
+    - <<: *if-default-refs
+      changes: *setup-test-env-patterns
+      when: manual
+    - <<: *if-merge-request-labels-run-all-rspec
+      when: manual