Update poetry install

readthedocs.yml

@@ -1,20 +1,28 @@
+# .readthedocs.yaml
 # 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
+# Set the OS, Python version and other tools you might need
 build:
-  os: ubuntu-20.04
-  tools: {python: "3.12"}
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
   jobs:
-    post_install:
+    post_create_environment:
+      # Install poetry
+      # https://python-poetry.org/docs/#installing-manually
       - pip install poetry==1.8.3
-      - poetry config virtualenvs.create false
-      - poetry install --with docs
+    post_install:
+      # Install dependencies with 'docs' dependency group
+      # https://python-poetry.org/docs/managing-dependencies/#dependency-groups
+      # VIRTUAL_ENV needs to be set manually for now.
+      # See https://github.com/readthedocs/readthedocs.org/pull/11152/
+      - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH poetry install --with docs
 
-# Build documentation in the docs/ directory with Sphinx
+# Build documentation in the "docs/" directory with Sphinx
 sphinx:
   configuration: docs/conf.py
   fail_on_warning: false