Add rake task to check db schema is valid

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

.gitlab-ci.yml

@@ -517,6 +517,12 @@ db:seed_fu-mysql:
   <<: *db-seed_fu
   <<: *use-mysql
+db:check-schema-pg:
+  <<: *db-migrate-reset
+  <<: *use-pg
+  script:
+    - source scripts/schema_changed.sh
+
 # Frontend-related jobs
 gitlab:assets:compile:
   <<: *dedicated-runner

scripts/schema_changed.sh

+function schema_changed() {
+  if [[ ! -z `git diff --name-only -- db/schema.rb` ]]; then
+    echo "db/schema.rb after rake db:migrate:reset is different from one in the repository"
+    exit 1
+  else
+    echo "db/schema.rb after rake db:migrate:reset matches one in the repository"
+  fi
+}
+
+schema_changed