Fix RTD builds with poetry (#65)

.github/workflows/build-docs.yaml

@@ -18,6 +18,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
+
       - name: Set up python
         id: setup-python
         uses: actions/setup-python@v5
@@ -60,6 +61,4 @@ jobs:
       #  build the docs
       #------------------
       - name: Build the docs
-        run: |
-          source .venv/bin/activate
-          make --directory=doc html
+        run: poetry run make --directory=doc html

.readthedocs.yaml

@@ -19,12 +19,13 @@ build:
       # Install poetry
       # https://python-poetry.org/docs/#installing-manually
       - pip install poetry
-      # Tell poetry to not use a virtual environment
-      - poetry config virtualenvs.create false
+      - poetry self add "poetry-dynamic-versioning[plugin]"
     post_install:
       # Install dependencies with 'docs' dependency group
       # https://python-poetry.org/docs/managing-dependencies/#dependency-groups
-      - poetry install --with docs,server
+      # 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,server
     pre_build:
       - ixmp4 server dump-schema -o doc/source/openapi-v1.json