[prefect-docker] add cached docker build and push steps

[zzstoatzz]

this will cache the results of the existing build and push steps in memory so that if the same build or push is requested during a build step more than once, it will no-op and the result will be fetched from the cache

opt out with ignore_cache: true

this is an alternative way to address #9921

usage

build:
    - prefect_docker.deployments.steps.build_docker_image:
        id: build-image
        requires: prefect-docker
        image_name: repo-name/image-name
        tag: dev

push:
    - prefect_docker.deployments.steps.push_docker_image:
        requires: prefect-docker
        image_name: repo-name/image-name
        tag: dev
        credentials: "{{ prefect.blocks.docker-registry-credentials.dev-registry }}"

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[chrisguidry]

This is rad! Alex and I were talking with a user yesterday about this exact issue

[desertaxle]

@zzstoatzz What do you think about incorporating this behavior into the existing steps? That way users get caching with no changes needed. We could have the caching behavior be opt-out with a ignore_cache kwarg.

[zzstoatzz]

@zzstoatzz What do you think about incorporating this behavior into the existing steps? That way users get caching with no changes needed. We could have the caching behavior be opt-out with a ignore_cache kwarg.

I was debating on whether to do that - yeah I can incorporate that into the existing steps

[github-actions]

This pull request is stale because it has been open 14 days with no activity. To keep this pull request open remove stale label or comment.

[github-actions]

This pull request was closed because it has been stale for 14 days with no activity. If this pull request is important or you have more to add feel free to re-open it.

[desertaxle]

Few small nits on logging, but otherwise LGTM!