refactor!: update minimum Ruby version to 3.0

.github/workflows/linters.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '2.7'
+          ruby-version: '3.0'
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
 
       - uses: reviewdog/action-setup@v1

.github/workflows/specs_rails60.yml

@@ -1,42 +0,0 @@
----
-name: Specs Rails 6.0
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
-
-jobs:
-  tests:
-    runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        ruby: ['2.6', '2.7']
-        gemfile: ['rails60_activeadmin22', 'rails60_activeadmin']
-
-    env:
-      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v2
-
-      - name: Set up Ruby
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: ${{ matrix.ruby }}
-          bundler-cache: true
-
-      - name: Run tests
-        run: bundle exec rspec --profile
-
-      - name: On failure, archive screenshots as artifacts
-        uses: actions/upload-artifact@v2
-        if: failure()
-        with:
-          name: test-failed-screenshots
-          path: spec/dummy/tmp/screenshots

.github/workflows/specs_rails61.yml

@@ -15,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['2.6', '2.7', '3.0']
+        ruby: ['3.0', '3.1', '3.2']
         gemfile: ['rails61_activeadmin29', 'rails61_activeadmin']
 
     env: