CI: Update ubuntu version

https://github.blog/changelog/2024-05-14-github-hosted-runners-public-beta-of-ubuntu-24-04-is-now-available/

.github/workflows/ci.yml

@@ -11,13 +11,28 @@ permissions:
 
 jobs:
   lint:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     timeout-minutes: 20
+    strategy:
+      matrix:
+        imagemagick-version:
+          - { full: 7.1.1-29, major-minor: '7.1' }
     name: Lint
     steps:
     - uses: actions/checkout@v4
       with:
         ref: ${{ github.event.pull_request.head.sha }}
+    - name: Cache ImageMagick
+      uses: actions/cache@v4
+      with:
+        path: ./build-ImageMagick
+        key: v1-linux-imagemagick-${{ matrix.imagemagick-version.full }}
+        restore-keys: |
+          v1-linux-imagemagick-${{ matrix.imagemagick-version.full }}
+    - name: Install ImageMagick ${{ matrix.imagemagick-version.full }}
+      run: |
+        export IMAGEMAGICK_VERSION=${{ matrix.imagemagick-version.full }}
+        ./before_install_linux.sh
     - name: Set up Ruby 3.0
       uses: ruby/setup-ruby@master
       with:
@@ -31,7 +46,7 @@ jobs:
       run: bundle exec rubocop
 
   test-ruby:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     timeout-minutes: 20
     strategy:
       matrix:
@@ -63,7 +78,7 @@ jobs:
       run: bundle exec rake
 
   test-jruby:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     timeout-minutes: 20
     strategy:
       matrix:

.rubocop.yml

@@ -9,6 +9,7 @@ AllCops:
     Exclude:
         - 'vendor/bundle/**/*'
         - 'rails_generators/gruff/**/*'
+        - 'build-ImageMagick/**/*'
 
 Metrics:
   Enabled: false