Make request tests run in parallel

.github/workflows/staging_pipeline.yml

@@ -220,6 +220,7 @@ jobs:
       DB_USERNAME: postgres
       DB_PASSWORD: password
       RAILS_MASTER_KEY: ${{ secrets.RAILS_MASTER_KEY }}
+      PARALLEL_TEST_PROCESSORS: 4
 
     steps:
       - name: Checkout
@@ -238,7 +239,7 @@ jobs:
 
       - name: Create database
         run: |
-          bundle exec rake db:prepare
+          bundle exec rake parallel:setup
 
       - name: Compile assets
         run: |
@@ -246,7 +247,7 @@ jobs:
 
       - name: Run tests
         run: |
-          bundle exec rspec spec/requests --fail-fast
+          bundle exec rake parallel:spec['spec/requests']
 
   lint:
     name: Lint