Hello! We have a couple of dockerfiles in the playpen too: https://github.com/ubuntu/snappy-playpen/tree/master/testing
We use them because we can't easily get xenial and lxd in travis, so we can't use cleanbuild. I wonder if we should get an official one. One thing I notice from your dockerfile is that you are installing some packages in addition to snapcraft. I think that could cause problems because any packages required to build the snap should be specified as build-packages in the snapcraft.yaml. pura vida.
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