[alibaba] Alibaba enablement in RHEL CoreOS pipeline

*USER STORY:*

As a SPLAT engineer, I want to interact with Alibaba engineering and support internal teams in the enablement of Alibaba images in the RHCOS pipeline so that up-to-date images can be used to ignition and run RHCOS there and support IPI development in future.

Task owner: ( ) Alibaba (X) Red Hat

*DESCRIPTION:*

Work with the internal stakeholders to add Alibaba images - introduced in SPLAT-158 - to the RHCOS pipeline. Images will be built, uploaded to Alibaba, and distributed across regions. Details about how to be distributed across regions and made publicly available and discoverable to Ignition are yet TBD.

*ACCEPTANCE CRITERIA:*

Alibaba must be one of the supported platforms in the RHCOS pipeline: https://releases-rhcos-art.cloud.privileged.psi.redhat.com/?stream=releases/rhcos-4.7

*ENGINEERING DETAILS:*

Related story: ART credentials https://issues.redhat.com/browse/DPP-3659
Related story: CoreOS & MCO enablement story https://issues.redhat.com/browse/GRPA-3312