[RFC PATCH 0/2] support generation of sdk container images

[Silvano Cirujano Cuesta <silvano.cirujano-cuesta@siemens.com>]

This patch series adds to the SDK generation (task `populate_sdk`) the
possibility of generating container images containing the SDK in
different formats (multiple formats can be generated at once).

Up-to-now the task `populate_sdk` generates the sdk root filesystem (in
both as a file tree and in a tarball) that can be chrooted to. The same
root filesystem can be easily distributed as a container image and
started as a container.

It's even possible extracting the root filesystem from a container
image, using the container image format only as a sort of packaging
system for easy distribution.

More information about its usage is documented in the file
docs/user_manual.md.

Typical container image management actions (e.g. push an image to a
container image regitry) are out of scope. Available tools (Docker,
Skopeo, Buildah, Podman,...) should be used for these actions.

Silvano Cirujano Cuesta (2):
  sdk: support creation of container image
  docs: document usage of sdk container images

 doc/user_manual.md                       | 70 +++++++++++++++++
 meta/classes/image-sdk-extension.bbclass | 99 ++++++++++++++++++++++--
 2 files changed, 162 insertions(+), 7 deletions(-)

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2.29.2