Nuke it from orbit.

.github/workflows/ci.yml

@@ -1,43 +1,31 @@
-name: Test
+name: Ruby
 
 on:
   push:
-    branches: [main, master] # TODO: rename and get rid of 'master'
-  # Triggers the workflow on pull request events.
+    branches: [ master, main ]
+    paths-ignore:
+      - '**/*.md'
   pull_request:
-    types: [opened, reopened, synchronize]
-  # Allows you to run this workflow manually from the Actions tab
-  workflow_dispatch:
-
-# This allows a subsequently queued workflow run to interrupt previous runs.
-concurrency:
-  group: "${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}"
-  cancel-in-progress: true
+    branches: [ master, main ]
+    paths-ignore:
+      - '**/*.md'
 
 jobs:
   test:
     strategy:
       matrix:
+        ruby-version: ['2.6', '2.7', '3.0', '3.1', '3.2', 'jruby']
         platform: [ubuntu-latest, macos-latest, windows-latest]
-        ruby:
-          # https://www.ruby-lang.org/en/downloads/branches/
-          - "ruby-3.0"
-          - "ruby-3.1"
-          - "ruby-3.2"
-          - "ruby-3.3"
-          - "ruby-head"
-          # https://github.com/jruby/jruby/discussions/7915
-          - "jruby-9.4"
-          - "jruby-head"
     runs-on: ${{ matrix.platform }}
-    name: "Test (Ruby ${{ matrix.ruby }})"
+
     steps:
-      - uses: actions/checkout@v4
-      - name: Set up Ruby
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: ${{ matrix.ruby }}
-          bundler-cache: true
-      - run: gem install bundler
-      - run: bundle install --jobs 4 --retry 2
-      - run: bundle exec rake
+    - uses: actions/checkout@v2
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true
+    - name: Run tests
+      run: gem install bundler
+      run: bundle exec rake
+