[Drone CI] migrate pipeline config from 0.x to 1.x

New syntax for pipeline and step

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- pipeline:
- custom-step:
- image: some-image
+ kind: pipeline
+ steps:
+ name: custom-step
+ image: some-image

Custom plugin variables should be placed under settings

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kind: pipeline
name: default
steps:
name: custom-plugin
image: some-image
- foo:
- bar: baz
+ settings:
+ foo:
+ bar: baz