Run flatware on CI

.github/workflows/test-ruby.yml

@@ -132,15 +132,17 @@ jobs:
           additional-system-dependencies: ffmpeg libpam-dev
 
       - name: Load database schema
-        run: './bin/rails db:create db:schema:load db:seed'
+        run: |
+          bin/rails db:setup
+          bin/flatware fan bin/rails db:test:prepare
 
-      - run: bin/rspec
+      - run: bin/flatware rspec -r ./spec/flatware_helper.rb
 
       - name: Upload coverage reports to Codecov
         if: matrix.ruby-version == '.ruby-version'
         uses: codecov/codecov-action@v4
         with:
-          files: coverage/lcov/mastodon.lcov
+          files: coverage/lcov/*.lcov
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 

spec/flatware_helper.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+if defined?(Flatware)
+  Flatware.configure do |config|
+    config.after_fork do |test_env_number|
+      unless ENV.fetch('DISABLE_SIMPLECOV', nil) == 'true'
+        require 'simplecov'
+        SimpleCov.at_fork.call(test_env_number) # Combines parallel coverage results
+      end
+    end
+  end
+end