Docker improvements

[kurthuwig]

No description provided.

[lephisto]

I will test the changes later today, thanks for that PR

[baylanger]

Reporting from my installation from last night and it didn't go well because ....

This first commit below with title "Windows fix" breaks apiscraper to start, at least not with Python 3.5.

tkrajina/srtm.py@a7c2fa4

The next commit removes support for Python 3.5 and adding 3.7 & 3.8 to the list.

tkrajina/srtm.py@87f417e

It is sad srtm is dropping support for 3.5 so. " early ". The Debian image comes with Python 3.5 and based on the above commit, it seems 3.6+ would work.

The below steps installs 3.7 and I confirm this makes latest SRTM commits all happy .. since I'm not Docker pro, please double check the steps.

{noformat}
RUN echo 'deb http://ftp.de.debian.org/debian testing main' >> /etc/apt/sources.list &&
echo 'APT::Default-Release "stable";' >> /etc/apt/apt.conf.d/00local &&
cat /etc/apt/sources.list &&
cat /etc/apt/apt.conf.d/00local

RUN apt-get update
&& DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends -t testing
python3.7
python3-distutils
python3-pip
&& rm -rf /var/lib/apt/lists/ /var/cache/apt/*
{noformat}