chore: bump version to 1.0.1

[rswanson]

Summary

• Bumps builder from 1.0.0 to 1.0.1. The 1.0.0 release shipped a Docker image that fails to run on amd64 hosts with exec /usr/local/bin/zenith-builder-example: exec format error, because the shared GHCR and ECR workflows in init4tech/actions produced single-arch (arm64-only) images. The shared workflow fixes are in fix: produce real multi-arch images from ghcr and ecr workflows actions#128 — once that lands, tagging v1.0.1 here will produce proper multi-arch manifest lists for both registries.

Test plan

• Merge fix: produce real multi-arch images from ghcr and ecr workflows actions#128 first
• Tag v1.0.1 after this merges and verify both registries publish manifest lists with linux/amd64 and linux/arm64:
  • docker manifest inspect <ecr-repo>/zenith-builder-example:1.0.1
  • docker manifest inspect ghcr.io/init4tech/builder:1.0.1
• Pull and run on an amd64 host (no exec format error)
• Pull and run on an arm64 host

🤖 Generated with Claude Code