Add optional rechunker and chunked stages that use chunkah for
content-based layer splitting. This allows folding the splitting step
into the build step.
Through some build arg and redirection trickery, this leaves the
unchunked path functionally identical.
Assisted-by: OpenCode (Claude Opus 4.6)
Following the bootc-dev repository-structure.md guidelines, add a Justfile
as the development entry point so CI flows are easily replicable locally.
The CI now invokes 'just <target>' instead of inline build commands.
Configuration is via environment variables:
TIER - content tier (standard, minimal, minimal-plus, iot)
FEDORA_VERSION - target Fedora release (rawhide, 43, 44, ...)
BUILDER - container build tool (buildah, podman)
CI tests each tier against both rawhide and Fedora 44, and smoke-tests
Fedora 43 with a standard build.
Assisted-by: OpenCode (Claude Opus 4)
