It runs containers via CRI interface in a pod sandbox. This is the very
first version: I tried not to introduce any changes to common runner
interface.
There should be some CRI-speficic options for the runner (like polling
interval, as it doesn't have nice `Wait()` API), plus my plan so far is
to use OCI as the common layer for container options, so that we can
analyze OCI and translate to CRI (when possible, return errors when
option is not implemented).
CRI interface doesn't have a concept of 'unpacking' an image, so we
probably need to unpack via containerd API (or any other
runtime-specific API) by targeting CRI namespace.
Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
This is preparation for implementing CRI runner.
CRI client moved into its own package, I split it into multiple files
and added rudimentary tests for it.
Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
