feat: add s390x and ppc64le support

[Nachiket-Roy]

Summary

Updates buildpack.toml and scripts/build.sh to add build support for the s390x and ppc64le architectures. This ensures the Go binaries for the buildpack are correctly compiled, stripped, compressed, and packaged for the new architectures.
rel : paketo-buildpacks/jammy-tiny-stack#257

Use Cases

This change provides native support for compiling and running the Quarkus buildpack on IBM Z (s390x) and IBM Power (ppc64le) systems, expanding the ecosystem's cross-platform compatibility.

Checklist

• I have viewed, signed, and submitted the Contributor License Agreement.
• I have linked issue(s) that this PR should close using keywords or the Github UI (See docs)
• I have added an integration test, if necessary.
• I have reviewed the styleguide for guidance on my code quality.
• I'm happy with the commit history on this PR (I have rebased/squashed as needed).