[builder] add kpack integration for building

[cppforlife]

we already support docker, and pack. let's add https://github.com/pivotal/kpack.

• should this be an external binary since this pulls in k8s libraries?
• kpack unlike pack does build+push step in one
• how to upload source code (tmp image?)?

[joaopapereira]

To answer some of your questions:

1. Kpack did release a binary version, so maybe we can integrate with it: https://github.com/vmware-tanzu/kpack-cli
2. This one I think is still the same as in May
3. kp image create have a flag --local-path that looks like it solves the source code upload for us.

[cppforlife]

kp image create have a flag --local-path that looks like it solves the source code upload for us.

oh that's very cool! i think the next step is to implement it and see if there are challenges with the workflow.

[MAHDTech]

Is it possible to use kbld with kpack yet?

[joaopapereira]

Not yet. If you are interested in trying to add it yourself we would be more than happy to lend a hand. But unfortunately, the maintainers at this point do not have much bandwidth to implement this, so it might take some time for us to get to this feature.