The use of manually calling localdef caused any future update to the
locales package to remove the manually installed locales, since
locale-gen takes precendence. This would usually be encountered when
a downstream Dockerfile added additional packages, and as a side effect
caused an upgrade to the locales package.
Fix by relying on the /etc/locale.gen file, which is the official place
to specify which locales should be installed.
Fixes#1112
I somehow missed Debian in 25b3034e9b (only updated Alpine), so this updates Debian in the same way.
> This still supports the "arbitrary user" use case but with slightly tighter permissions on the end result.
>
> This one is a little bit more "special" other images (due to the existing runtime/entrypoint modification of the directory modes) so I've tried to pick reasonable values for both halves.
Laurent Goderre