Have CI test migration paths

This commit adds a job to the pipeline to test if migration on seed
data works. Even though the seed data is not perfect, it does give more
guarentees that this will succeed in the real world too.

seed_fu is used instead of dev:setup to save some time, as they both
generate the data in the same way, this should be fine.

.gitlab-ci.yml

@@ -248,6 +248,21 @@ bundler:audit:
   script:
     - "bundle exec bundle-audit check --update --ignore OSVDB-115941"
 
+migration paths:
+  stage: test
+  <<: *use-db
+  only:
+    - master@gitlab-org/gitlab-ce
+  script:
+    - git checkout HEAD .
+    - git fetch --tags
+    - git checkout v8.5.9
+    - 'echo test: unix:/var/opt/gitlab/redis/redis.socket > config/resque.yml'
+    - bundle install --without postgres production --jobs $(nproc) "${FLAGS[@]}" --retry=3
+    - rake db:drop db:create db:schema:load db:seed_fu
+    - git checkout $CI_BUILD_REF
+    - rake db:migrate
+
 coverage:
   stage: post-test
   services: []
@@ -263,7 +278,6 @@ coverage:
     - coverage/index.html
     - coverage/assets/
 
-
 # Notify slack in the end
 
 notify:slack:

CHANGELOG

@@ -24,6 +24,7 @@ v 8.12.0 (unreleased)
   - Add white background for no readme container (ClemMakesApps)
   - API: Expose issue confidentiality flag. (Robert Schilling)
   - Fix markdown anchor icon interaction (ClemMakesApps)
+  - Test migration paths from 8.5 until current release !4874
   - Optimistic locking for Issues and Merge Requests (title and description overriding prevention)
   - Add `wiki_page_events` to project hook APIs (Ben Boeckel)
   - Remove Gitorious import