ci: kernel image storage migration
Due to the expiration time in mesa-lava
(1m), the kernel in mesa is proposed to now use mesa-rootfs
(1y). This change has converted the hard-coded strings into variables.
It has been prepared a fresh kernel image with the tag v6.6.21-mesa-f8ea that pushes the artifacts to https://s3.freedesktop.org/mesa-rootfs/gfx-ci/linux/v6.6.21-mesa-f8ea/...
. Then this change in mesa uses this kernel that is taken from the new place.
As we've been checking the S3
buckets, this merge request includes a conversion to variables when addressing one of those buckets. This way we propose to have an inventory of the buckets available and avoid to hard-code strings when we point to one of those buckets.