Simplify GitHub Actions workflow

.github/workflows/test.yml

@@ -9,25 +9,13 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: ruby
     steps:
       - uses: actions/checkout@v6
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
-        env:
-          BUNDLE_GEMFILE: ruby/Gemfile
         with:
           ruby-version: 4.0.0
-          bundler-cache: true
+      - name: Bootstrap
+        run: make bootstrap
       - name: Run tests
-        run: bundle exec rake test
-      - name: Run standard
-        run: bundle exec rake standard
-      - name: Install C dependencies
-        working-directory: .
-        run: sudo apt-get update && sudo apt-get install -y libreadline-dev
-      - name: Run C tests
-        working-directory: .
-        run: make c
+        run: make

Makefile

@@ -1,6 +1,13 @@
 default: c ruby
 
 bootstrap:
+	@if command -v apt-get >/dev/null 2>&1; then \
+		sudo apt-get update && sudo apt-get install -y libreadline-dev; \
+	elif command -v brew >/dev/null 2>&1; then \
+		brew list readline >/dev/null 2>&1 || brew install readline; \
+	else \
+		echo "Please install readline (e.g. libreadline-dev or Homebrew readline)."; \
+	fi
 	cd ruby && bundle install --jobs 8
 
 c: