Feat: move action to worker with a dispatcher

bopytex/planner/fake_planner.py

@@ -4,6 +4,6 @@ from bopytex.tasks import Task
 def simple(options: dict) -> list[Task]:
     """Simple planner with options['quantity'] tasks and no dependencies"""
     return [
-        Task("Do", args={"number": i}, deps=[], output=f"{i}")
+        Task("DO", args={"number": i}, deps=[], output=f"{i}")
         for i in range(options["quantity"])
     ]