Install graphiz and jing

Author: tomschr

.github/workflows/ci.yml

@@ -23,6 +23,9 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Install jing
+        run: sudo apt-get update && sudo apt-get install -y jing
+
       - name: Install the latest version of uv
         id: setup-uv
         uses: astral-sh/setup-uv@v6

.github/workflows/gh-pages.yml

@@ -17,6 +17,9 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Install Graphviz
+        run: sudo apt-get update && sudo apt-get install -y graphviz
+
       - name: Install the latest version of uv
         id: setup-uv
         uses: astral-sh/setup-uv@v6