Switch to running tests with rspec directly

.gitlab-ci.yml

@@ -22,7 +22,7 @@ rails spec:
   script:
     - cd /app
     - bundle exec rails db:migrate
-    - bundle exec rails spec
+    - bundle exec rspec
   artifacts:
     paths:
       - specs_with_runtime.txt

README.md

@@ -21,6 +21,12 @@ Development (without mail confirmation and separate database):
 $ RAILS_ENV=development rails server
 ```
 
+## Testing
+Running tests works as follows:
+```bash
+bundle exec rspec
+```
+
 ## Docker
 [Registry](https://gitlab.com/turniere/turniere-backend/container_registry)