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sid generic build artifacts exceed GitLab size limits

Has been happening consistently for some time. See https://salsa.debian.org/cloud-admin-team/debian-cloud-images-daily/-/jobs/5082675 for an example.

Seems to be something in the generic images that is failing to compress well. Comparing the sid EC2 images with the sid generic images pre- and post-compression:

854M -rw-r--r-- 1 admin admin 854M Feb  2 22:38 image_sid_ec2_amd64.tar
755M -rw-r--r-- 1 admin admin 755M Feb  2 22:26 image_sid_generic_amd64.tar

191M -rw-r--r-- 1 admin admin 191M Feb  2 22:38 image_sid_ec2_amd64.tar.xz
256M -rw-r--r-- 1 admin admin 256M Feb  2 22:26 image_sid_generic_amd64.tar.xz

So the ec2 images compresses to 22% of original size, while generic compresses to 33% of original size.

@waldi has suggested that the addition of xz compression to the kernel modules (of which there are more in the generic images) may be the cause, which seems plausible.