Prefect deployment via Docker

I am trying to run a deployment using prefect Docker. But for some reason it doesn’t run

Here is my docker block

prefect_docker_block = "de-prefect-docker"

def create_docker_image() -> None:
    docker = DockerContainer(
        image=PREFECT_DOCKER_IMAGE,
        image_pull_policy="ALWAYS",
        auto_remove=True,
    )
    docker.save(prefect_docker_block, overwrite=True)

def deploy_docker_container(docker_container_block) -> None:
    deployment = Deployment.build_from_flow(
        flow=main,
        name="de-prefect-docker",
        infrastructure=docker_container_block,
        path="",
        parameters={"prefix": "2022-04-15", "history_file": "null"},
        entrypoint="scripts/gcs_to_bq.py:main",
        ignore_file=".prefectignore",
        skip_upload=True,
    )
    deployment.apply()


if __name__ == "__main__":
    # load_dotenv()
    PREFECT_DOCKER_IMAGE = os.environ.get("PREFECT_DOCKER_IMAGE")
    create_docker_image()
    # deploy job on Docker image
    docker_container_block = DockerContainer.load(prefect_docker_block)
    deploy_docker_container(docker_container_block)

I execute the block like so

python scripts/prefect_flow_via_docker.py

Then run the deployment

prefect deployment run main/de-prefect-docker

But I receive this message

Deployment 'main/de-prefect-docker' not found!

My Docker file

FROM python:3.8.3

ARG PREFECT_API_KEY
ENV PREFECT_API_KEY=$PREFECT_API_KEY

ARG PREFECT_API_URL
ENV PREFECT_API_URL=$PREFECT_API_URL

ARG GCP_DATASET_NAME
ENV GCP_DATASET_NAME=$GCP_DATASET_NAME

ARG GCP_DATASET_TABLE_NAME
ENV GCP_DATASET_TABLE_NAME=$GCP_DATASET_TABLE_NAME

ARG GCP_PROJECT_ID
ENV GCP_PROJECT_ID=$GCP_PROJECT_ID

ARG GCP_REGION
ENV GCP_REGION=$GCP_REGION

COPY poetry.lock .
COPY pyproject.toml .

RUN pip install poetry --trusted-host pypi.python.org --no-cache-dir
RUN poetry config virtualenvs.create false
RUN poetry install --no-root --without dev

RUN mkdir scripts
COPY scripts/ scripts/

In Prefect Cloud UI, I can see that the docker container has been created. But I not sure what I am missing. Any idea?

When I run the deployment from the Cloud UI, I get the following error:

Flow could not be retrieved from deployment. FileNotFoundError: [Errno 2] No such file or directory: '/opt/prefect/flows'

my flow is located inside scripts/ inside the container.