linux: add tool to test release and beta builds on different distributions

[remusao]

This script (which only runs on Linux) can be used to test Cliqz builds on a matrix of different distributions. The idea would be to allow automating some basic tests on the different operating systems that we support. This PR is only a first step towards that goal. The script is able to build a custom docker image and install Cliqz (beta or release versions), on any of the <os> supported (see below) as well as with a specified <flavor> (e.g. rpm, deb, ppa, aur); not all operating systems support all flavors. Here is the usage:

Usage: run.sh <channel> <os> <flavor> [<archive>]
  where:
    <channel> must be one of:
      - beta
      - release
      - local
    <os> must be one of:
      - ubuntu
      - ubuntu:16.04
      - ubuntu:18.04
      - ubuntu:19.04
      - ubuntu:19.10
      - debian
      - debian:10
      - debian:buster
      - opensuse
      - opensuse:15
      - opensuse:leap
      - opensuse:16
      - opensuse:tumbleweed
      - fedora
      - fedora:28
      - fedora:29
      - fedora:30
      - fedora:31
      - centos
      - centos:8
      - archlinux
    <flavor> must be one of:
      - ppa
      - deb
      - rpm
      - aur

Examples:
  ./run.sh release ubuntu ppa
  ./run.sh release debian:buster deb
  ./run.sh beta ubuntu:18.04 ppa
  ./run.sh beta opensuse:tumbleweed rpm
  ./run.sh local opensuse rpm ./foo/bar/cliqz.rpm
  ./run.sh local ubuntu deb ./foo/bar/cliqz.deb

[philipp-classen]

Nice tool. I had some stylistic comments, but overall it looks good!

[remusao]

@alver-cliqz Good to go from my side. Let me know if you wanna discuss next steps there.

[remusao]

@philipp-classen I've updated the script with the ability to test a local .deb or .rpm, and also cleaned-up some aspects of the code. ./run.sh local ubuntu deb ./foo/bar/cliqz.deb