This Docker image is to work around an AppArmor issue with LXC which affects Docker builds on CircleCI that attempt to change the locale. You will see this kind of error message:
Generating locales...
cannot change mode of new locale archive: No such file or directory
en_US.UTF-8... failed
Generation complete.
Generating locales...
cannot change mode of new locale archive: No such file or directory
en_US.UTF-8... failed
Generation complete.
The suggested workaround from CircleCI is to create a separate image with the locale already set, so that's what this is.
MIT license.