Install graphviz on RTDC

dstansby · dstansby · commit 30569be3a2d7 · 2026-03-19T15:28:33.000Z
diff --git a/.readthedocs.yml b/.readthedocs.yml
@@ -4,6 +4,9 @@ build:
   os: ubuntu-24.04
   tools:
     python: "3.13"
+  apt_packages:
+    - graphviz
+
 
 python:
   install:
