ci: update Ubuntu runner to 24.04 LTS

Author: mshibuya

.github/workflows/test.yml

@@ -39,17 +39,17 @@ jobs:
           - ruby: jruby-head
             gemfile: gemfiles/rails-7-0.gemfile
             experimental: false
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     continue-on-error: ${{ matrix.experimental }}
     env:
       BUNDLE_GEMFILE: ${{ matrix.gemfile }}
       JRUBY_OPTS: --debug
     steps:
     - uses: actions/checkout@v4
-    - name: Setup ImageMagick policy
-      run: sudo sh -c 'echo '\''<policymap><policy domain="coder" rights="read|write" pattern="PDF" /></policymap>'\'' > /etc/ImageMagick-6/policy.xml'
     - name: Update package list
       run: sudo apt update
+    - name: Inatall ImageMagick and setup policy
+      run: sudo apt-get install imagemagick && sudo sh -c 'echo '\''<policymap><policy domain="coder" rights="read|write" pattern="PDF" /></policymap>'\'' > /etc/ImageMagick-6/policy.xml'
     - name: Install ghostscript to process PDF
       run: sudo apt-get -y install ghostscript
     - name: Install libvips-dev for Carrierwave::Vips
@@ -66,7 +66,7 @@ jobs:
 
   rubocop:
     name: RuboCop
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v4
       - name: Set up Ruby