App source metadata

[matthewmcnew]

A recent/upcoming change to the cloud native buildpacks spec will provide support for source metadata on the resulting image. This will be an update to the platform api and will require kpack to preprocess the source metadata. Additionally, kpack will need to provide the project-metadata.toml to the exporter.

This is blocked on the lifecycle support.

[matthewmcnew]

#287 provides support from git.

Additionally, we need to add support to read spring boot provided metadata: #264. Possibly, from registry source as well.

[jromero]

Going to try to do #264.

Could you elaborate on "registry source"?

[jromero]

Started working on proposing a convention that can work for both pack and kpack here: buildpacks/community#120 (comment)

Any feedback on that thread would be appreciated.

I'm honestly more interested in resolving how project.toml information would interact with other app source metadata. I've made a proposal on that thread here: buildpacks/community#120 (comment)

EDIT: It's worth noting that I've added this to the platform sync agenda for later today: https://docs.google.com/document/d/1zBYJsBwcwLZ5huG4nt7t7kYqaL1W_J12WuLsr2a9mAo/edit#