Fix apk repositories for edge images

[andypost]

Fixes #375

[andypost]

it does not build because minirootfs archives missing

[julianxhokaxhiu]

If you set fs_version=3.8.0 it will build fine. Look at the directory structure and you will see that this is the maximum we can get from the edge folder ( eg. for aarch64, http://dl-cdn.alpinelinux.org/alpine/edge/releases/aarch64/ )

[andypost]

Yes, it builds fine but still contains 3.8 and /etc/apk/repoditories points to 3.8 as well

Probably it needs some sed on it to replace

Would be great to get @ncopa POV

[julianxhokaxhiu]

Looking better at the repository structure, you don't even need to patch the options files.

Instead you have to run the script mentioned here and just replace the relative rootfs for each architecture: https://github.com/gliderlabs/docker-alpine/tree/master/builder

Then this PR will be good to go.

[ncopa]

we should make upstream minirootfs images for edge too

[andypost]

Yep, that's where I stuck

[J0WI]

Is there any kind of help that can be provided to get this fixed?