Support for Garden Linux images

[pnpavlov]

As software engineer I would like to have SapMachine container images based on Garden Linux.

My requirements to images are that:

• Garden Linux images are pulled from the Garden Linux official repository and based on the latest major release in support.
• the build process is based on public resources (no private/protected resources are used).
• support the stable SapMachine LTS versions.
• the SapMachine on Garden Linux are published in https://github.com/orgs/SAP/packages

[pnpavlov]

Pushed images for SapMachine Long Term Support Releases (LTS) 11, 17 and 21 based on Garden Linux 1592 in https://github.com/orgs/SAP/packages/container/sapmachine/versions?filters%5Bversion_type%5D=tagged

[pnpavlov]

@RealCLanger @nice2mitja , added you as admins in https://github.com/orgs/SAP/packages/container/sapmachine/settings