feat: support rechunking using Chunkah#790
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Add a `--chunkah` option to `bluebuild build` that rechunks the image using [Chunkah](https://github.com/coreos/chunkah), a more modern, content-agnostic rechunker that's actively maintained and should offer various improvements over build-chunked-oci and the legacy rechunker. This is implemented using a fairly generic "post-build hook" mechanism that allows a post-processing step (such as rechunking) to be applied after building the image but before tagging and pushing.
The next version of Chunkah will be able to write the output directly to an OCI directory, which is more efficient for both time and disk space when copying to local containers storage. Note: this will require using the `dev` tag of Chunkah until a new release is made.
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Add a
--chunkahoption tobluebuild buildthat rechunks the image using Chunkah, a more modern, content-agnostic rechunker that's actively maintained and should offer various improvements over build-chunked-oci and the legacy rechunker.This is implemented using a fairly generic "post-build hook" mechanism that allows a post-processing step (such as rechunking) to be applied after building the image but before tagging and pushing.