Add the artifact packaging stage that assembles deployable LXC/Podman
bundles with a normalized layout (manifest, payload, checksums, metadata).
The task also computes digests/metadata and removes intermediate build
outputs once final artifacts are produced.
https://onedigi.atlassian.net/browse/DEL-10004
Signed-off-by: Francisco Gil <francisco.gilmartinez@digi.com>
Signed-off-by: Isaac Hermida <isaac.hermida@digi.com>