Add instructions on how to build from a local Docker image #234
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I have often needed to build a Apptainer container from a local Docker image (not from a remote image in a Docker registry). I think that this might be a relatively popular use-case, but currently this workaround is only described in an issue on GitHub (apptainer/singularity#1537 (comment)).
It would be nice to also have it in the official docs.