add local ci

{{cookiecutter.project_slug}}/tasks.py

@@ -28,6 +28,20 @@ def test(c):
     c.run("uv run pytest --cov=src --cov-report=term-missing")
 
 
+@task
+def ci(c):
+    """Run lint and tests in a clean Docker container."""
+    image = "{{ cookiecutter.project_slug }}-ci"
+    c.run(f"docker build --network=host -t {image} .")
+    cmd = (
+        "uv run ruff check src tests && "
+        "uv run ruff format --check src tests && "
+        "uv run mypy src && "
+        "uv run pytest --cov=src --cov-report=term-missing"
+    )
+    c.run(f"docker run --rm {image} sh -c '{cmd}'")
+
+
 @task
 def clean(c):
     """Preview files to delete (safe mode)."""