[CI] Revert fork detection changes in amdvlk cron build
[CI] Revert fork detection changes in amdvlk cron build

Recent commits to the workflow creating the base image
for amdvlk did not work. This are seems to be undocumented,
so I'm reverting all the changes for now and will reach out to
github community forums and support.

googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc