runner fails to start shell in docker image with 'sh: 1: set: Illegal option -o pipefail'

Summary

Using a docker gitlab-runner is unable to open shell in a docker container. It fails with sh: 1: set: Illegal option -o pipefail every time when it would like execute 'script' tag content.

Steps to reproduce

Try to do any step on the cdrx/pyinstaller-linux container available on docker hub.

According to its Dockerfile it is container based on ubuntu:16.04. With the ubuntu container, it works seamlesly.

https://github.com/cdrx/docker-pyinstaller/blob/master/linux/py3/Dockerfile

I found no exoctic step in it, which would change the shell behavior.

example .gitlab-ci.yml

image: cdrx/pyinstaller-linux

reproduce:
  script:
    - echo "Hello, World!"

Actual behavior

Instead of running the script, gives the following error:

sh -c if [ -x /usr/local/bin/bash ]; then
	exec /usr/local/bin/bash 
elif [ -x /usr/bin/bash ]; then
	exec /usr/bin/bash 
elif [ -x /bin/bash ]; then
	exec /bin/bash 
elif [ -x /usr/local/bin/sh ]; then
	exec /usr/local/bin/sh 
elif [ -x /usr/bin/sh ]; then
	exec /usr/bin/sh 
elif [ -x /bin/sh ]; then
	exec /bin/sh 
elif [ -x /busybox/sh ]; then
	exec /busybox/sh 
else
	echo shell not found
	exit 1
fi


sh: 1: set: Illegal option -o pipefail

Expected behavior

The gitlab-ci provided script shall run smoothly.

Relevant logs and/or screenshots`

Running with gitlab-runner 11.3.1 (0aa5179e)
  on docker-runner bc7817da
Using Docker executor with image cdrx/pyinstaller-linux ...
Pulling docker image cdrx/pyinstaller-linux ...
Using docker image sha256:d90268a5f7f2c01edc85889cd057ab9958e17b8a68a9b0a307341e4a122926d3 for cdrx/pyinstaller-linux ...
Running on runner-bc7817da-project-12-concurrent-0 via MYSERVER...
Fetching changes...
HEAD is now at 1e18409 try bare minimal
From http://gitlab.mydomain.com/mygroup/myproject
   1e18409..cea2908  master     -> origin/master
Checking out cea2908d as master...
Skipping Git submodules setup
sh -c if [ -x /usr/local/bin/bash ]; then
	exec /usr/local/bin/bash 
elif [ -x /usr/bin/bash ]; then
	exec /usr/bin/bash 
elif [ -x /bin/bash ]; then
	exec /bin/bash 
elif [ -x /usr/local/bin/sh ]; then
	exec /usr/local/bin/sh 
elif [ -x /usr/bin/sh ]; then
	exec /usr/bin/sh 
elif [ -x /bin/sh ]; then
	exec /bin/sh 
elif [ -x /busybox/sh ]; then
	exec /busybox/sh 
else
	echo shell not found
	exit 1
fi


sh: 1: set: Illegal option -o pipefail
sh -c if [ -x /usr/local/bin/bash ]; then
	exec /usr/local/bin/bash 
elif [ -x /usr/bin/bash ]; then
	exec /usr/bin/bash 
elif [ -x /bin/bash ]; then
	exec /bin/bash 
elif [ -x /usr/local/bin/sh ]; then
	exec /usr/local/bin/sh 
elif [ -x /usr/bin/sh ]; then
	exec /usr/bin/sh 
elif [ -x /bin/sh ]; then
	exec /bin/sh 
elif [ -x /busybox/sh ]; then
	exec /busybox/sh 
else
	echo shell not found
	exit 1
fi


sh: 1: set: Illegal option -o pipefail
ERROR: Job failed: exit code 2

Environment description

No special environment. Basic gitlab install with docker usage.

Used GitLab Runner version

I first reproduced it with following versions:

	version
gitlab	10.1.0
gitlab-runner	10.7

Then I updated the runner to 11.3.1. It did not solve the problem, so I updated the gitlab as well to 10.8.7.

The issue is still present.