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Hey all! I'm trying to use `DocekrStorage`, and my `Dockerfile` looks like the below. It gets through all the steps except the final step with an error. Does anyone know how to resolve this?

What is your Prefect version locally when you do this?

<@U01QEJ9PP53> we actually have images already built (from somewhere else) in ECR. Can we just use those instead of trying to have us build them with `DockerStorage`?

Yeah totally just point to them with `KubernetesRun(image="…")` and then your Storage becomes `LocalStorage(path_to_file="some/path/in/container/flow.py")` or something like that.

Ah that may be a bit off. Let me just give you an example <https://github.com/anna-geller/packaging-prefect-flows/blob/master/flows_no_build/docker_script_kubernetes_run_custom_ecr_image.py|here> from Anna. Note the `build=False` in the register call

Can you move the error to the thread to keep the main channel a bit cleaner when you get the chance?

```Step 16/16 : RUN python /opt/prefect/healthcheck.py '["/opt/prefect/flows/dbt.prefect"]' '(3, 8)'
 ---&gt; Running in 24a30f5c6416
Beginning health checks...
System Version check: OK
/opt/prefect/healthcheck.py:152: UserWarning: Flow uses module which is not importable. Refer to documentation on how to import custom mo
dules <https://docs.prefect.io/api/latest/storage.html#docker>
  flows = cloudpickle_deserialization_check(flow_file_paths)
Traceback (most recent call last):
  File "/opt/prefect/healthcheck.py", line 152, in &lt;module&gt;
    flows = cloudpickle_deserialization_check(flow_file_paths)
  File "/opt/prefect/healthcheck.py", line 44, in cloudpickle_deserialization_check
    flows.append(cloudpickle.loads(flow_bytes))
ModuleNotFoundError: No module named 'prefect.backend'

The command '/bin/sh -c python /opt/prefect/healthcheck.py '["/opt/prefect/flows/dbt.prefect"]' '(3, 8)'' returned a non-zero code: 1
    Error building storage:
      Traceback (most recent call last):
        File "/usr/local/lib/python3.8/site-packages/prefect/cli/build_register.py", line 463, in build_and_register
    storage.build()
        File "/usr/local/lib/python3.8/site-packages/prefect/storage/docker.py", line 308, in build
    self._build_image(push=push)
        File "/usr/local/lib/python3.8/site-packages/prefect/storage/docker.py", line 373, in _build_image
    raise ValueError(
      ValueError: Your docker image failed to build!  Your flow might have failed one of its deployment health checks - please ensure tha
t all necessary files and dependencies have been included.

  Registering 'dbt'... Error```
`Dockerfile` contents:

```FROM prefecthq/prefect:latest-python3.8

ENV PIP_NO_CACHE_DIR=1

# Copying some stuff from our repo into the image.
COPY workflows /workflows
COPY app /app

RUN pip install -r workflows/requirements.txt
RUN pip install -e /workflows
RUN pip install -e /app

ENV PYTHONPATH=/```


Sure thing <@U01QEJ9PP53>. Sorry; good call.

Are you referring to this one? <https://docs.prefect.io/api/latest/storage.html#local>

Yeah so local is the default and it saves things on the local machine, but you can also use it to specify a file relative to your container