Update apt-get before installing Image Magick

Author: MartinDelille

.github/workflows/html_proofer.yml

@@ -8,7 +8,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Install Image Magick
-        run: sudo apt-get install imagemagick
+        run: sudo apt-get update && sudo apt-get install imagemagick
       - uses: ruby/setup-ruby@v1
         with:
           bundler-cache: true

.github/workflows/jekyll.yml

@@ -26,7 +26,7 @@ jobs:
       - name: NPM install
         run: npm install
       - name: Install Image Magick
-        run: sudo apt-get install imagemagick
+        run: sudo apt-get update && sudo apt-get install imagemagick
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with: