Activating venv in CI (#100)

This avoids requiring repetitive `poetry run` usage, and slightly speed
up steps.
It might make #99 work too.

.github/actions/setup/action.yml

@@ -16,3 +16,9 @@ runs:
       shell: bash
     - run: poetry check --lock
       shell: bash
+    # Activate venv.
+    - run: |
+        VIRTUAL_ENV=$(poetry env info --path)
+        echo "VIRTUAL_ENV=$VIRTUAL_ENV" >> $GITHUB_ENV
+        echo "$VIRTUAL_ENV/bin" >> $GITHUB_PATH
+      shell: bash

.github/workflows/build.yml

@@ -44,17 +44,17 @@ jobs:
     - name: Install dependencies
       run: poetry install --no-root --all-extras
     - name: Install lib versions
-      run: poetry run pip install -e .[pytest,trio] ${{ matrix.lib-versions }}
+      run: pip install -e .[pytest,trio] ${{ matrix.lib-versions }}
     # Run checks.
     - name: Check (ruff)
-      run: poetry run ruff check
+      run: ruff check
     - name: Check (ruff format)
-      run: poetry run ruff format --check
+      run: ruff format --check
     - name: Check (mypy)
-      run: poetry run mypy
+      run: mypy
     # Run tests.
     - name: Test
-      run: poetry run coverage run -m pytest
+      run: coverage run -m pytest
     # Upload coverage.
     - name: Upload coverage
       uses: actions/upload-artifact@v4
@@ -74,7 +74,7 @@ jobs:
       run: poetry install --all-extras --only main --only docs
     # Build docs.
     - name: Build docs
-      run: poetry run sphinx-build -W docs docs/_build
+      run: sphinx-build -W docs docs/_build
 
   report:
     runs-on: ubuntu-latest
@@ -97,9 +97,9 @@ jobs:
         pattern: .coverage.*
         merge-multiple: true
     - name: Combine coverage
-      run: poetry run coverage combine .coverage.*
+      run: coverage combine .coverage.*
     - name: Report coverage
-      run: poetry run coverage report
+      run: coverage report
     # Fail if any `needs` job was not a success.
     # Along with `if: always()`, this allows this job to act as a single required status check for the entire workflow.
     - name: Fail on workflow error