opencv docker container install steps:

- starting with: https://funvision.blogspot.com/2017/10/opencv-docker-ubuntu-image.html

- apt-get install build-essential

- apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev

- then we need to add an old repo because jasper got removed recently: ... well that failed because obviously going back to an old distro to install a package was stupid.

- trying:

apt-get install opencv-data
apt-get install libopencv-dev 

-> yAS

but we need DEBIAN_FRONTEND="noninteractive" and apt-get install --yes
