RTD builder: add graphviz depedendency (#11040)

marxin · web-flow · commit bf4a62682684 · 2022-12-20T12:30:59.000Z
diff --git a/.readthedocs.yml b/.readthedocs.yml
@@ -4,6 +4,8 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3"
+  apt_packages:
+    - graphviz
 
 formats:
   - pdf
