[SLE-16.0] Autoload the installation profile from the medium root (jsc#PED-16010)

[lslezak]

Problem

• The https://jira.suse.com/browse/PED-16010 is requested also for 16.0

Solution

• Backport Autoload the installation profile from the medium root (jsc#PED-16010) #3366 to SLE-16.0
• Only the list of predefined places has been updated, the logging was not changed to have a minimal patch for 16.0

Testing

• Tested manually with a patched ISO image

# journalctl -u agama-autoinstall.service
Apr 14 16:30:30 agama systemd[1]: Started Agama automatic profile runner.
Apr 14 16:30:30 agama agama-autoinstall[5443]: Could not load the configuration from label://OEMDRV/autoinst.jsonnet
Apr 14 16:30:30 agama agama-autoinstall[5443]: Could not load the configuration from label://OEMDRV/autoinst.json
Apr 14 16:30:33 agama agama-autoinstall[5443]: Could not load the configuration from label://OEMDRV/autoinst.xml
Apr 14 16:30:33 agama agama-autoinstall[5443]: Could not load the configuration from file:///run/initramfs/live/autoinst.jsonnet
Apr 14 16:30:42 agama agama-autoinstall[5443]: Configuration loaded from file:///run/initramfs/live/autoinst.json
Apr 14 16:30:42 agama agama-autoinstall[5443]: Skipping the auto-installation on user's request (inst.install=0)
Apr 14 16:30:42 agama systemd[1]: agama-autoinstall.service: Deactivated successfully.
Apr 14 16:30:42 agama systemd[1]: agama-autoinstall.service: Consumed 1.125s CPU time, 18.2M memory peak.

The /autoinst.json from the ISO was found and successfully loaded.

Notes

• The openAPI CI job fails as it uses the old Ubuntu based definition which does not work anymore, just ignore the failure. Later we should update the CI definitions.