Install python 3.6 for building HTTPS-Everywhere
The next HTTPSE release, to be released on monday, is converting all the toolings to python 3.6, including the components of the build script. To be able to build HTTPSE, we will need to install python 3.6.
To do that, we can either use a debian
buster (testing) container, or build python 3.6 from sources.