update to docker-compose to 1.8.0

[Govinda-Fichtner]

Update to Compose 1.8:

• the update of pip is not strictly necessary but seems to do no harm either

pyinstalller

• fix_pyinstaller.sh is important as the upstream Compose repo installs pyinstaller as a pip package via requirements.txt
• the problem with the standard pyinstaller package is that there is not support for linux-arm
• thus we need to get it ourselves and patch support for ARM into it
• we need to disable the installation of pyinstaller via pip
• we also need to call pyinstaller directly as there is no appropriate binary in $VENV/bin

The results of those changes can be found in our packagecloud.io repository.

[StefanScherer]

Drone failed, but seems to be an internal error. Restarting.

[StefanScherer]

Fixed by increasing timeout in drone for this build.

[StefanScherer]

LGTM 💪