Fixes bad indentation in ECS Worker Guide

[EmilRex]

Checklist

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[zzstoatzz]

@EmilRex Im pretty sure these are both valid right? and all of the current docs examples use the existing format

[zzstoatzz]

I think we should articulate what's wrong with the existing format and if we do, update the existing examples that use the current format

if I run prefect deploy with these build steps now, it works fine

build:
- prefect.deployments.steps.run_shell_script:
    id: get-commit-hash
    script: git rev-parse --short HEAD
    stream_output: false
- prefect_docker.deployments.steps.build_docker_image:
    requires: prefect-docker>=0.3.0
    image_name: my-image
    tag: "{{ get-commit-hash.stdout }}"
    dockerfile: some.Dockerfile

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[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.