Revert "TUR-76 disable rspec matrix pipeline"

This reverts commit f90d21eeb6.

.gitlab-ci.yml

@@ -15,6 +15,10 @@ rails spec:
   tags:
     - docker
   image: $CI_REGISTRY_IMAGE/test/commits:$CI_COMMIT_SHA
+  parallel:
+    matrix:
+      - RSPEC_NODE_INDEX: ["1", "2", "3", "4", "5", "6", "7", "8"]
+        RSPEC_NODE_TOTAL: "8"
   rules:
     - if: $SKIP_TEST
       when: never
@@ -28,7 +32,11 @@ rails spec:
   script:
     - cd /app
     - inv db-migrate
-    - inv test
+    - inv test-shard --node-index=$RSPEC_NODE_INDEX --node-total=$RSPEC_NODE_TOTAL
+  artifacts:
+    paths:
+      - specs_with_runtime.txt
+    expire_in: 30 days
 
 rails e2e spec:
   stage: test