Add support for s390x

[agracey]

What happened?

• What were you attempting to do? Build images on System Z with Paketo Buildpacks.

• What did you expect to happen? The developer should not know or care what ISA is being targeted when they push their code. The buildpack would run as expected.

I would hope that with the help of the IBM OSS team, this should be the same work as aarch64: https://github.com/paketo-buildpacks/stacks/issues/51

• What was the actual behavior? Please provide log output, if possible. Not supported at this time.

Build Configuration

• What platform (pack, kpack, tekton buildpacks plugin, etc.) are you using? Please include a version. We are using Epinio, which runs the buildpack as a k8s Job but have a few customers who are looking at also using Tekton.

• What buildpacks are you using? Please include versions. We've seen java and python being the most requested.

• What builder are you using? If custom, can you provide the output from pack inspect-builder <builder>? paketobuildpacks/builder:full

• Can you provide a sample app or relevant configuration (buildpack.yml, nginx.conf, etc.)?

Checklist

• [ ] I have included log output.
• [ ] The log output includes an error message.
• [ ] I have included steps for reproduction.

[agracey]

Upstream ticket for tooling: https://github.com/buildpacks/lifecycle/issues/811

[sophiewigmore]

@agracey thanks for filing an issue. We'll track this with our efforts towards supporting multiple architectures in our stacks/buildpacks