add extra script for pipeline deletion (#3123)

docs/book/how-to/build-pipelines/delete-a-pipeline.md

@@ -26,6 +26,34 @@ Deleting a pipeline does not automatically delete any of its associated runs or
 artifacts.
 {% endhint %}
 
+If you want to delete multiple pipelines at once, you might find the Python SDK
+preferable. If you have pipelines with the same prefix, you will need to pass in
+the `id` of each pipeline separately so ZenML is able to identify them. In this
+case, you could use a script like the following:
+
+```python
+from zenml.client import Client
+
+client = Client()
+
+# Get the list of pipelines that start with "test_pipeline"
+# use a large size to ensure we get all of them
+pipelines_list = client.list_pipelines(name="startswith:test_pipeline", size=100)
+
+target_pipeline_ids = [p.id for p in pipelines_list.items]
+
+print(f"Found {len(target_pipeline_ids)} pipelines to delete")
+
+confirmation = input("Do you really want to delete these pipelines? (y/n): ").lower()
+
+if confirmation == 'y':
+    print(f"Deleting {len(target_pipeline_ids)} pipelines")
+    for pid in target_pipeline_ids:
+        client.delete_pipeline(pid)
+    print("Deletion complete")
+else:
+    print("Deletion cancelled")
+```
 
 ## Delete a pipeline run