Add graphviz package to doc build config

cmarqu · cmarqu · commit c130497b87fb · 2023-10-29T21:24:20.000+01:00
This makes the 'dot' binary available to sphinx.ext.inheritance-diagrams See also readthedocs/readthedocs.org#8672 Closes cocotb#3449
diff --git a/.readthedocs.yml b/.readthedocs.yml
@@ -8,6 +8,8 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.11"
+  apt_packages:
+    - graphviz
 
 python:
   install:
