oh-my-zsh error when running via Dockerfile

gistfile1.txt

tep 5 : RUN wget https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh -O - | zsh
 ---> Running in 3502f0a0f03a
converted 'https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh' (ANSI_X3.4-1968) -> 'https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh' (UTF-8)
--2015-06-09 08:28:40--  https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh
Resolving github.com (github.com)... 192.30.252.128
Connecting to github.com (github.com)|192.30.252.128|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh [following]
converted 'https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh' (ANSI_X3.4-1968) -> 'https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh' (UTF-8)
--2015-06-09 08:28:40--  https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 23.235.46.133
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|23.235.46.133|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2033 (2.0K) [text/plain]
Saving to: 'STDOUT'
Cloning Oh My Zsh...

     0K .                                                     100% 6.30M=0s

2015-06-09 08:28:40 (6.30 MB/s) - written to stdout [2033/2033]

Cloning into '/root/.oh-my-zsh'...
Looking for an existing zsh config...
Using the Oh My Zsh template file and adding it to ~/.zshrc
Copying your current PATH and adding it to the end of ~/.zshrc for you.
2015/06/09 01:28:41 The command [/bin/sh -c wget https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh -O - | zsh] returned a non-zero code: 1