Single user mode doesn't work for many commands

[SethRobertson]

You cannot have multiline commands, table creates do not seem to always work, etc.

[md5]

You're right that --single is limited in what it can do. The main limitation I'm aware of with --single is that implicit array types are not created. That being said, the multiline issue can be avoided by passing the -j flag to postgres --single.

I thought there was an issue in the docker-library/postgres repo regarding the implicit array type thing, but the only discussion I can find is for my appropriate/postgis image: postgis/docker-postgis#2 (comment)

[md5]

I believe this PR is superceeded by the changes in #291.