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These two packages almost always end up being required by programs,
but people don't necessarily consider them.
They will now always be added and their popularity is artificially
inflated to ensure they end up at the top of the layer list.
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Image layers in manifests are now sorted in a stable (descending)
order based on their merge rating, meaning that layers more likely to
be shared between images come first.
The reason for this change is Docker's handling of image layers on
overlayfs2: Images are condensed into a single representation on disk
after downloading.
Due to this Docker will constantly redownload all layers that are
applied in a different order in different images (layer order matters
in imperatively created images), based on something it calls the
'ChainID'.
Sorting the layers this way raises the likelihood of a long chain of
matching layers at the beginning of an image.
This relates to #39.
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The new build process can now call out to Nix to create layers and
upload them to the bucket if necessary.
The layer cache is populated, but not yet used.
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This creates a cache key which can be used to check if a layer has
already been built.
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Refactors the layer grouping package (which previously compiled to a
separate binary) to expose the layer grouping logic via a function
instead.
This is the next step towards creating layers inside of the server
component instead of in Nix.
Relates to #50.
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