Validation error when using anonymous volumes

[anze3db]

Bug summary

It looks like Prefect's validation doesn't allow anonymous volumes. This is my volume configuration:

That throws the following Validation error:

19:30:34.753 | ERROR   | prefect.flow_runs.worker - Failed to submit flow run 'e8d1029c-8368-4063-a208-8bf8305b7c6e' to infrastructure.
Traceback (most recent call last):
  File "/Users/anzepecar/app/.venv/lib/python3.12/site-packages/prefect/workers/base.py", line 1007, in _submit_run_and_capture_errors
    configuration = await self._get_configuration(flow_run)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/anzepecar/app/.venv/lib/python3.12/site-packages/prefect/workers/base.py", line 1105, in _get_configuration
    configuration = await self.job_configuration.from_template_and_values(
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/anzepecar/app/.venv/lib/python3.12/site-packages/prefect/client/utilities.py", line 99, in with_injected_client
    return await fn(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/anzepecar/app/.venv/lib/python3.12/site-packages/prefect/workers/base.py", line 188, in from_template_and_values
    return cls(**populated_configuration)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/anzepecar/app/.venv/lib/python3.12/site-packages/pydantic/main.py", line 214, in __init__
    validated_self = self.__pydantic_validator__.validate_python(data, self_instance=self)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pydantic_core._pydantic_core.ValidationError: 1 validation error for DockerWorkerJobConfiguration
volumes.1
  Value error, Invalid volume string: '/opt/watchpointlabs/.venv' [type=value_error, input_value='/opt/watchpointlabs/.venv', input_type=str]
    For further information visit https://errors.pydantic.dev/2.10/v/value_error
19:30:34.769 | INFO    | prefect.flow_runs.worker - Reported flow run 'e8d1029c-8368-4063-a208-8bf8305b7c6e' as crashed: Flow run could not be submitted to infrastructure:
1 validation error for DockerWorkerJobConfiguration
volumes.1

Is there a reason for not allowing anonymous volumes? They can be very useful useful for development purposes as also mentioned in the uv docs.

I'm happy to open a PR that fixes this, let me know!

Version info

Version:             3.1.15
API version:         0.8.4
Python version:      3.12.6
Git commit:          3ac3d548
Built:               Thu, Jan 30, 2025 11:31 AM
OS/Arch:             darwin/arm64
Profile:             local
Server type:         server
Pydantic version:    2.10.6
Integrations:
  prefect-docker:    0.6.2

Additional context

No response

[zzstoatzz]

hi @anze3db - thanks for raising this. i'm not aware of a reason we'd forbid anonymous volumes here, so I've opened #17022 to allow them! let me know what you think

[anze3db]

@zzstoatzz that PR looks good, thanks!