chore: import upstream snapshot with attribution

docs/workflow/task/retrieve.md

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+# Retrieve Task
+
+![task](../../images/task.png#only-light)
+![task](../../images/task-dark.png#only-dark)
+
+The Retrieve Task connects to a url and downloads the content locally. This task is helpful when working with actions that require data to be available locally.
+
+## Example
+
+The following shows a simple example using this task as part of a workflow.
+
+```python
+from txtai.workflow import RetrieveTask, Workflow
+
+workflow = Workflow([RetrieveTask(directory="/tmp")])
+workflow(["https://file.to.download", "/local/file/to/copy"])
+```
+
+## Configuration-driven example
+
+This task can also be created with workflow configuration.
+
+```yaml
+workflow:
+  tasks:
+    - task: retrieve
+      directory: /tmp
+```
+
+## Methods
+
+Python documentation for the task.
+
+### ::: txtai.workflow.RetrieveTask.__init__
+### ::: txtai.workflow.RetrieveTask.register