Breaks on PIP version 10.0.0

[cjoy]

When building and running via docker compose, I get the following error

Setting up python-all-dev (2.7.13-2) ...Setting up python-cryptography (1.7.1-3) ...Setting up python-secretstorage (2.3.1-2) ...
Setting up python-keyring (10.1-1) ...
Processing triggers for libc-bin (2.24-11+deb9u3) ...
Collecting pip
  Downloading https://files.pythonhosted.org/packages/62/a1/0d452b6901b0157a0134fd27ba89bf95a857fbda64ba52e1ca2cf61d8412/pip-10.0.0-py2.py3-none-any.whl (1.3MB)
Installing collected packages: pip
  Found existing installation: pip 9.0.1
    Not uninstalling pip at /usr/lib/python2.7/dist-packages, outside environment /usr
Successfully installed pip-10.0.0
Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    from pip import main
ImportError: cannot import name main
ERROR: Service 'geoserver' failed to build: The command '/bin/sh -c apt-get update     && apt-get -y upgrade     && apt-get install -y python python-pip python-dev     && chmod +x /usr/local/tomcat/tmp/set_geoserver_auth.sh     && chmod +x /usr/local/tomcat/tmp/setup_auth.sh     && chmod +x /usr/local/tomcat/tmp/entrypoint.sh     && pip install --upgrade pip     && pip install -r requirements.txt     && chmod +x /usr/local/tomcat/tmp/get_dockerhost_ip.py     && chmod +x /usr/local/tomcat/tmp/get_nginxhost_ip.py' returned a non-zero code: 1

However, I was able to fix this issue by using an older version of pip.
Ie. Replacing line 82 in the Dockerfile from
&& pip install --upgrade pip \
to
&& pip install --upgrade pip==9.0.3 \

[afabiani]

Should be fixed now