Dockerfile not working

Created by: HannoSpreeuw

Describe the bug These commands from bash: wget https://raw.githubusercontent.com/ornladios/ADIOS2/master/scripts/docker/images/ubuntu18.04/Dockerfile docker build -t adios2_im .

output

Cloning into 'ADIOS2'...
CMake Error at CMakeLists.txt:6 (cmake_minimum_required):
  CMake 3.12 or higher is required.  You are running version 3.10.2

Expected behavior A succesful build of the Ubuntu Bionic Docker image with Adios2 installed.

Desktop (please complete the following information): This is on Manjaro Linux 19.0.2. Docker version 19.03.6-ce, build 369ce74a3c

Additional context Can fix this by using

# FROM ubuntu:18.04
FROM ubuntu:19.10

Also, the paths need to be fixed or very few Unix commands can be issued from within a shell in the container:

ENV PYTHONPATH="/usr/local/lib/python3.6/site-packages/:/opt/adios2/lib/python3.6/site-packages:${PYTHONPATH}"
ENV PATH="/opt/adios2/bin:${PATH}"
ENV LD_LIBRARY_PATH="/usr/local/lib:/opt/zfp/lib:/opt/sz/lib:/opt/adios2/lib:${LD_LIBRARY_PATH}"

E.g. ls will not work without the addition of :${PATH}.

Please let me know if you will accept a PR for these changes.