Add example DAG for task group (#293)

This PR adds an example for the task group. 
Depend on PR: #292

<img width="1678" alt="Screenshot 2024-11-19 at 6 23 42 PM"
src="https://github.com/user-attachments/assets/7203fc6a-940b-4a99-9fc2-c189b0fb70b6">

dev/dags/example_task_group.py

@@ -0,0 +1,17 @@
+import os
+from pathlib import Path
+
+# The following import is here so Airflow parses this file
+# from airflow import DAG
+import dagfactory
+
+DEFAULT_CONFIG_ROOT_DIR = "/usr/local/airflow/dags/"
+CONFIG_ROOT_DIR = Path(os.getenv("CONFIG_ROOT_DIR", DEFAULT_CONFIG_ROOT_DIR))
+
+config_file = str(CONFIG_ROOT_DIR / "example_task_group.yml")
+
+example_dag_factory = dagfactory.DagFactory(config_file)
+
+# Creating task dependencies
+example_dag_factory.clean_dags(globals())
+example_dag_factory.generate_dags(globals())

dev/dags/example_task_group.yml

@@ -0,0 +1,30 @@
+default:
+  default_args:
+    owner: default_owner
+    retries: 1
+    retry_delay_sec: 300
+    start_date: 2024-01-01
+  default_view: tree
+  max_active_runs: 1
+  schedule_interval: 0 1 * * *
+example_task_group:
+  description: "this dag uses task groups"
+  task_groups:
+    task_group_1:
+      tooltip: "this is a task group"
+      dependencies: [task_1]
+    task_group_2:
+      tooltip: "this is a task group"
+      parent_group_name: task_group_1
+  tasks:
+    task_1:
+      operator: airflow.operators.bash_operator.BashOperator
+      bash_command: "echo 1"
+    task_2:
+      operator: airflow.operators.bash_operator.BashOperator
+      bash_command: "echo 2"
+      task_group_name: task_group_1
+    task_4:
+      operator: airflow.operators.bash_operator.BashOperator
+      bash_command: "echo 4"
+      task_group_name: task_group_2