Get up to speed on the existing work

[pnpavlov]

Task one is to read carefully the existing docs:
OCI Initial Delivery#32
RFD OCI Implementation Specification

[mxmxchere]

The current open ends are:

• Integration of the glcli oci tool into the build pipeline integrate oci delivery gardenlinux#2292 Integration of OCI delivery in gardenlinux build pipelines python-gardenlinux-lib#15
• Refining of the behavior of the glcli oci tool, I have the feeling that it needs a bit of polishing still (tests, edgecases)