Fix user creation example in Ubuntu-based docker images #1243
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The `adduser` command uses `-D` to mean "create with defaults". The `useradd` command uses `-D` to mean "show or edit the defaults". man pages: - [`useradd`](https://manpages.debian.org/jessie/passwd/useradd.8.en.html) - [`adduser](https://manpages.debian.org/jessie/adduser/adduser.8.en.html) (Those are for Debian, but they are very similar for every other distro that I checked)
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The
addusercommand uses-Dto mean "create with defaults". Theuseraddcommand uses-Dto mean "show or edit the defaults".The comment says "make this change in Alpine images", but the actual code line below it is wrong for the Debian-based images.
man pages:
useraddadduser