Install ImageMagick dependency

Author: iChebbi

.github/workflows/build.yml

@@ -13,6 +13,8 @@ jobs:
       - uses: actions/checkout@v4
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
+      - name: Install ImageMagick
+        run: sudo apt-get update && sudo apt-get install -y libmagickwand-dev
       - name: Install dependencies
         run: bundle install
       - name: Run tests