Add Ruby4.0 to the CI matrix

also add several tweaks to CI

Author: willnet

.github/workflows/test.yml

@@ -14,13 +14,11 @@ jobs:
   test:
     runs-on: ubuntu-latest
 
-    container: ${{ matrix.ruby }}
-
     strategy:
       fail-fast: false
 
       matrix:
-        ruby-version: ['2.3', '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', 'head']
+        ruby-version: ['2.3', '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', '4.0', 'head']
         include:
           - ruby-version: 'head'
             allow_failures: 'true'
@@ -32,10 +30,9 @@ jobs:
         with:
           ruby-version: ${{ matrix.ruby-version }}
           bundler-cache: true
+
       - name: Run test
-        run: |
-          set -xe
-          bundle exec rake
+        run: bundle exec rake
         continue-on-error: ${{ matrix.allow_failures == 'true' }}
 
       - name: Coveralls
@@ -48,7 +45,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.3
+          ruby-version: ruby
           bundler-cache: true
       - name: Run type check
         run: bundle exec steep check --with-expectations