Commits on Feb 9, 2022

1. docker, blobCache: try to reuse compressed blobs from all known compr… …

   …essed digests
   
   It seems we try to reuse blobs only for the specified registry, however
   we can have valid known compressed digests across registry as well
   following pr attempts to use that by doing following steps.
   
   * Move all known blobs into common data scope i.e `all` instead of
     storing them in seperate registry.
   
   * Increase the sample set of potential blob reuse to all known
     compressed digests , also involving the one which do not belong to
   current registry.
   
   * If a blob is found match it against the registry where we are
     attempting to push. If blob is already there consider it a `CACHE
   HIT!` and reply skipping blob, since its already there.
   
   * Remove all images `buildah rmi --all` // needed so all new blobs can
     be tagged again in common bucket
   * Remove any previous `blob-info-cache` by
   
   ```console
   rm /home/<user>/.local/share/containers/cache/blob-info-cache-v1.boltdb
   ```
   
   ```console
   $ skopeo copy docker://registry.fedoraproject.org/fedora-minimal docker://quay.io/fl/test:some-tag
   $ buildah pull registry.fedoraproject.org/fedora-minimal
   $ buildah tag registry.fedoraproject.org/fedora-minimal quay.io/fl/test
   $ buildah push quay.io/fl/test
   ```
   
   ```console
   Getting image source signatures
   Copying blob a3497ca15bbf skipped: already exists
   Copying config f7e02de757 done
   Writing manifest to image destination
   Storing signatures
   ```
   
   Signed-off-by: Aditya R <arajan@redhat.com>

   

   flouthoc committed Feb 9, 2022
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