Indentation problem not caught by bitbucket-pipelines.yml json schema

[Dylan Landry]

I had a deployment fail recently because I incorrectly indented a part of the file. We run this file against the bitbucket pipeline json schema to validate it, but didn't catch it.

I tried to copy and paste the pipeline here, but it somehow removes all the indentation. I'll do my best to fix it.

```

definitions:

    steps:

        - step: &build-docker-image

            services:

                - docker           

```

The problem is that the `services` part should be indented one more time. So that it is accessible within the `step` object like `steps[0].step.services`. As opposed to being a sibling property of `step` like `steps[0].services`.

I don't know exactly why this issue is not caught by the json schema. When I look at it the `definitions` schema doesn't even have a property for `steps`. So I'm not sure how autocomplete is even working for that part of the file.