Bump 0.1.29

[runcom]

@rhatdan @mtrmac @nlewo PTAL

[runcom]

I will tag 7add6fc as v0.1.29

[mtrmac]

ACK, please merge whenever it works for you.

[rhatdan]

@runcom I will build packages, but could you create a release doc describing what has changed.

[nlewo]

@runcom @mtrmac cool, thanks!

[rhatdan]

@runcom lets get a blog published on Monday with the new features. Most are from containers/image

Here is what I put in the skopeo.spec

• Updated containers/image
  docker-archive generates docker legacy compatible images
  Do not create $DiffID subdirectories for layers with no configs
  Ensure the layer IDs in legacy docker/tarfile metadata are unique
  docker-archive: repeated layers are symlinked in the tar file
  sysregistries: remove all trailing slashes
  Improve docker/* error messages
  Fix failure to make auth directory
  Create a new slice in Schema1.UpdateLayerInfos
  Drop unused storageImageDestination.{image,systemContext}
  Load a *storage.Image only once in storageImageSource
  Support gzip for docker-archive files
  Remove .tar extension from blob and config file names
  ostree, src: support copy of compressed layers
  ostree: re-pull layer if it misses uncompressed_digest|uncompressed_size
  image: fix docker schema v1 -> OCI conversion
  Add /etc/containers/certs.d as default certs directory

[runcom]

@rhatdan +1