Concourse CI: make a pipeline public

Concourse by default hides newly created pipelines from the public. That’s not in the interest of Open Source projects, which want to show the entire build process.

The fly command expose-pipeline will reveal a pipeline, and hide-pipeline will stash it away.

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fly --target ci expose-pipeline --pipeline example

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fly --target ci hide-pipeline --pipeline example

A pipeline which is exposed will still not show build logs. For that, every job must be set to public: true as well.

Unfortunately it does not seem to be possible to set the exposure in the pipeline definition itself. Therefore the expose-pipeline command must be re-executed if the pipeline is destroyed and recreated.