Spike: Lifecycle should apply Dockerfiles for the run image

[natalieparellano]

Broken out from #709

(7) Lifecycle should apply Dockerfiles for the run image - new phase

It should apply them in the order determined during detection
For each Dockerfile:

• base_image and build_id must be provided
• args from launch.toml must be provided
  It should ensure that the label io.buildpacks.rebasable=true on the final image only if the original run image and ALL Dockerfiles set it to true

[natalieparellano]

Completed as part of #709 (see comment).