Install dependent tools

Author: pawchen

.github/workflows/optimize.yml

@@ -15,7 +15,7 @@ jobs:
 
       - name: Install tools
         run: |
-          sudo apt-get install -y webp minify parallel
+          sudo apt-get install -y webp imagemagick minify parallel
 
       - name: Optimize still images
         run: >
@@ -25,7 +25,7 @@ jobs:
       - name: Optimize gif images
         run: >
           find pages/ -iname "*.gif" -print0
-          | parallel -0 'mogrify -format webp {} && rm {}'
+          | parallel -0 'magick mogrify -format webp {} && rm {}'
 
       - name: Optimize text
         run: |