builds latest webkitgtk version which can then be installed on amd64 debian stretch system
to copy the compiled webkitgtk+ tar.gz do the following:
docker pull marvambass/webkitgtk
docker create --name webkitgtk marvambass/webkitgtk
docker cp webkitgtk:/wk.tar.gz wk.tar.gz
docker rm -f webkitgtk
# to extract and install it
tar xvf wk.tar.gz
cd webkit*/
sudo ./install