ci/cirrus: align with gha

In particular, run mypy on FreeBSD in a parallel workflow to pytest.

Also modernize how we install/set up Poetry, and improve job names.

.cirrus.yml

@@ -1,35 +1,51 @@
 freebsd_instance:
   image_family: freebsd-14-0
+  # Cirrus has a concurrency limit of 8 vCPUs for FreeBSD. Allow executing 4 tasks in parallel.
   cpu: 2
   memory: 4G
 
-test_task:
-  name: "Tests / FreeBSD / "
+env:
+  # SHELL is not set by default, and we have tests that depend on it.
+  SHELL: sh
+
+tests_task:
   only_if: $CIRRUS_TAG == ''
-  skip: "!changesInclude('.cirrus.yml', 'poetry.lock', 'pyproject.toml', 'src/**.py', 'tests/**')"
   env:
-    # `SHELL` environment variable is not set by default, so we explicitly set it to
-    # avoid failures on tests that depend on it.
-    SHELL: sh
     matrix:
-      - PYTHON: python3.8
-      - PYTHON: python3.9
-      - PYTHON: python3.10
-      - PYTHON: python3.11
-  install_prereqs_script:
-    - V=$(printf '%s' $PYTHON | tr -d '.[:alpha:]')
-    - pkg install -y python${V} py${V}-sqlite3
-  install_poetry_script:
-    - POETRY_HOME=/opt/poetry
-    - $PYTHON -m venv $POETRY_HOME
-    - $POETRY_HOME/bin/pip install --upgrade pip setuptools wheel
-    - $POETRY_HOME/bin/pip install poetry
-    - echo "PATH=$POETRY_HOME/bin:$PATH" >> $CIRRUS_ENV
-  install_and_test_script:
-    - poetry install
-    - poetry run pytest --junitxml=junit.xml -v
-  on_failure:
-    annotate_failure_artifacts:
-      path: junit.xml
-      format: junit
-      type: text/xml
+      - PY: 3.8
+      - PY: 3.9
+      - PY: 3.10
+      - PY: 3.11
+  bootstrap_poetry_script:
+    - V=$(printf '%s' "$PY" | tr -d '.')
+    - pkg install -y python${V} py${V}-sqlite3 # devel/py-pipx
+    - python -m ensurepip && pip install pipx
+    - pipx ensurepath
+    - pipx install poetry
+  setup_environment_script:
+    # - ln -sf /usr/local/local/bin/python${PY} /usr/local/bin/python
+    - poetry install --sync
+    - poetry env info
+    - poetry show
+  matrix:
+    - alias: pytest
+      name: "Tests / pytest [FreeBSD / Python ${PY}]"
+      skip: "!changesInclude('.cirrus.yml', 'poetry.lock', 'pyproject.toml', 'src/**.py', 'tests/**')"
+      pytest_script:
+      - poetry run pytest --integration -v --junitxml=junit.xml
+      on_failure:
+        annotate_failure_artifacts:
+          path: junit.xml
+          format: junit
+          type: text/xml
+    - alias: mypy
+      name: "Tests / mypy [FreeBSD / Python ${PY}]"
+      skip: "!changesInclude('.cirrus.yml', 'poetry.lock', 'pyproject.toml', 'src/**.py')"
+      mypy_script:
+      - poetry run mypy
+
+status_task:
+  name: Status
+  depends_on:
+    - pytest
+    - mypy