Mark dev dependency group as optional and update CI to use it

Author: youtux

.github/workflows/main.yml

@@ -81,7 +81,7 @@ jobs:
       - name: Install dev dependencies
         if: steps.poetry-dependencies-cache.outputs.cache-hit != 'true'
         run: |
-          poetry install
+          poetry install --with=dev
       - name: Download artifact
         uses: actions/download-artifact@v4
         with:

pyproject.toml

@@ -44,6 +44,9 @@ repository = "https://github.com/pytest-dev/pytest-factoryboy"
 [tool.poetry]
 packages = [{include = "pytest_factoryboy", from = "src"}]
 
+[tool.poetry.group.dev]
+optional = true
+
 [tool.poetry.group.dev.dependencies]
 mypy = ">=1.4.1"
 tox = ">=4.0.8"