Test including ocaml in rtd ci

Author: panglesd

.readthedocs.yaml

@@ -13,6 +13,18 @@ build:
     # nodejs: "20"
     # rust: "1.70"
     # golang: "1.20"
+  apt_packages:
+    - opam
+    - build-essential
+    - m4
+
+jobs:
+  post_install:
+    # Sandboxing must be disabled in Docker
+    - opam init --disable-sandboxing -y
+    - opam install --deps-only .
+  pre_build:
+    - opam exec -- dune build
 
 # Build documentation in the "docs/" directory with Sphinx
 sphinx: