ci: Update GitHub workflows

.github/workflows/linters.yml

@@ -12,6 +12,13 @@ jobs:
     name: reviewdog
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        ruby: ['3.0']
+
+    env:
+      RUBY_VERSION: ${{ matrix.ruby }}
+
     steps:
       - name: Check out code
         uses: actions/checkout@v4
@@ -19,8 +26,8 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.0'
-          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
 
       - uses: reviewdog/action-setup@v1
         with:

.github/workflows/specs_rails61.yml

@@ -15,11 +15,10 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.2']
-        gemfile: ['rails61_activeadmin29', 'rails61_activeadmin']
+        ruby: ['3.0', '3.1']
 
     env:
-      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
+      RAILS_VERSION: 6.1.0
 
     steps:
       - name: Checkout repository

.github/workflows/specs_rails70.yml

@@ -15,11 +15,10 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.3']
-        gemfile: ['rails70_activeadmin']
+        ruby: ['3.1']
 
     env:
-      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
+      RAILS_VERSION: 7.0.0
 
     steps:
       - name: Checkout repository

.github/workflows/specs_rails71.yml

@@ -15,11 +15,10 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.2', '3.4']
-        gemfile: ['rails71_activeadmin']
+        ruby: ['3.2']
 
     env:
-      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
+      RAILS_VERSION: 7.1.0
 
     steps:
       - name: Checkout repository

.github/workflows/specs_rails72.yml

@@ -16,10 +16,9 @@ jobs:
     strategy:
       matrix:
         ruby: ['3.2', '3.4']
-        gemfile: ['rails72_activeadmin']
 
     env:
-      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
+      RAILS_VERSION: 7.2.0
 
     steps:
       - name: Checkout repository

.github/workflows/specs_rails80.yml

@@ -15,11 +15,10 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.2', '3.4']
-        gemfile: ['rails80_activeadmin']
+        ruby: ['3.2', '3.3', '3.4']
 
     env:
-      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
+      RAILS_VERSION: 8.0.0
 
     steps:
       - name: Checkout repository