fix docbuild

.readthedocs.yaml

@@ -0,0 +1,18 @@
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.9"
+
+  commands:
+    - pip install --upgrade --no-cache-dir pip
+    - pip install --no-cache-dir "poetry>=1.4" "crashtest==0.4.1"
+    - poetry install --with=doc --without=test
+    - poetry run make html -C docs
+    - cp -r docs/build _readthedocs