@Marvin how can the Prefect CLI can help me build custom images

The Prefect CLI can assist you in building custom Docker images for your deployments through the

prefect init

command. Here's how to use the CLI for this purpose: 1. You can initialize a deployment recipe using the CLI and specify that you'd like to use Docker with the

--recipe docker

flag. 2. You can use the

--field

flags to set specific values for your Docker image, such as the image name and tag. For example:

bash
   prefect init --recipe docker --field image_name=my-repo/my-image --field tag=my-tag

3. In your recipe, as outlined in the generated YAML, you will define the build step with the necessary package, image name, tag, and whether you want to push the image to a Docker repository. Here is an example of a build step from the YAML file:

yaml
build:
  - prefect_docker.deployments.steps.build_docker_image:
      requires: prefect-docker>=0.3.0
      image_name: my-repo/my-image
      tag: my-tag
      dockerfile: auto
      push: true

The

prefect-docker

package is used here, and the step will automatically build a Docker image with the provided name and tag before pushing it to the specified repository. It's recommended to use

{{ image }}

within

prefect.yaml

, particularly within the job variables section of the work pool, to keep the build step and deployment specification in sync without hardcoding values. Additionally, you can create complex deployments by combining multiple steps. For instance, to build a Docker image tagged with the current commit hash, you could use a

run_shell_script

step and pass the output into a

build_docker_image

step. To read more about how the Prefect CLI can help you create custom images and for a detailed guide on Docker with Prefect, you can visit the Docker guide in the Prefect documentation.