DEV: Enable parallel system specs in GitHub actions CI (#19584)

.github/workflows/tests.yml

@@ -29,7 +29,7 @@ jobs:
       RAILS_ENV: test
       PGUSER: discourse
       PGPASSWORD: discourse
-      USES_PARALLEL_DATABASES: ${{ matrix.build_type == 'backend' }}
+      USES_PARALLEL_DATABASES: ${{ matrix.build_type == 'backend' || matrix.build_type == 'system' }}
       CAPBYARA_DEFAULT_MAX_WAIT_TIME: 4
 
     strategy:
@@ -173,13 +173,17 @@ jobs:
         if: matrix.build_type == 'system'
         run: bin/ember-cli --build
 
+      - name: Setup Webdriver
+        if: matrix.build_type == 'system'
+        run: bin/rails runner "require 'webdrivers'; Webdrivers::Chromedriver.update"
+
       - name: Core System Tests
         if: matrix.build_type == 'system' && matrix.target == 'core'
-        run: bin/rspec spec/system --format documentation --profile
+        run: PARALLEL_TEST_PROCESSORS=4 bin/turbo_rspec --verbose spec/system
 
       - name: Plugin System Tests
         if: matrix.build_type == 'system' && matrix.target == 'plugins'
-        run: LOAD_PLUGINS=1 bin/rspec plugins/*/spec/system --format documentation --profile
+        run: LOAD_PLUGINS=1 PARALLEL_TEST_PROCESSORS=4 bin/turbo_rspec --verbose plugins/*/spec/system
 
       - name: Upload failed system test screenshots
         uses: actions/upload-artifact@v3