Update and simplify CI workflow

Author: jgarber623

.github/workflows/ci.yml

@@ -4,8 +4,6 @@ on:
   pull_request:
   push:
     branches: [main]
-  schedule:
-    - cron: "0 12 * * 3"
   workflow_call:
   workflow_dispatch:
 
@@ -18,15 +16,14 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true
-      - run: bundle exec standardrb
+      - run: bundle exec rubocop
   test:
-    name: Test
+    name: Test (Ruby ${{ matrix.ruby }})
     runs-on: ubuntu-latest
     needs: lint
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-latest, ubuntu-latest]
         ruby: ["3.0", "3.1", "3.2", "3.3"]
     steps:
       - uses: actions/checkout@v4