Revert "remove backports pinning of linux-image-amd64 (#89)"
Revert "remove backports pinning of linux-image-amd64 (#89)"

This reverts commit 2f0c53484ee13ec2bb64e717ba67343bb2923e82.

We actually need to use a newer kernel for docker

pixelated/puppet-pixelated,PuZZleDucK/pixelated-platform,pixelated/puppet-pixelated,pixelated/puppet-pixelated,pixelated/puppet-pixelated,PuZZleDucK/pixelated-platform,PuZZleDucK/pixelated-platform,PuZZleDucK/pixelated-platform