perl warnings

[sscien]

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

[sscien]

Set up this in bashrc won't work

export LANGUAGE=en_US.UTF-8
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
export LC_CTYPE=en_US.UTF-8

You have to set up the locale in the image

Solution:
RUN locale-gen en_US.UTF-8 #quiet locale warnings

in the Dockerfile

[sscien]

set up the locale in the image
One way to do this is
RUN locale-gen en_US.UTF-8 #quiet locale warnings
in the Dockerfile

Another way
you could add export LANG=C to your .bashrc to make that permanent