Buildpacks: support Dockerfiles

[natalieparellano]

CNB RFC 105 introduces the concept of image extensions to the CNB spec. Image extensions output Dockerfiles that can be used to extend build or run-time base images prior to buildpack execution.

Because of the complexity involved, this feature will be implemented using a phased approach (more information can be found buildpacks/rfcs#224). Lifecycle 0.15.0 will have support for phases 1 and 2. Lifecycle 0.17.0 will have support for phase 3.

If this is implemented this should help to close out #1070 (for the 5 phase workflow) - although we may want to duplicate the task since image extensions require experimental features to be enabled, and that may not be desired by all users.

[tekton-robot]

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[natalieparellano]

/remove-lifecycle stale (still relevant)

[tekton-robot]

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[natalieparellano]

/remove-lifecycle stale (still relevant)

Upstream tracking issue: buildpacks/rfcs#224

We'd love some help on this one if anyone has interest and bandwidth

[tekton-robot]

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[tekton-robot]

@tekton-robot: Closing this issue.

In response to this:

Rotten issues close after 30d of inactivity.
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