The APT archive used by the Ubuntu docker image can be slow, even timing
out sometimes, causing spurious failures of the containers-build job.
The Debian docker image uses deb.debian.org, which is backed by a
content distribution network.
One downside is that stretch only has GCC 6, whereas bionic had 7.
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
There shouldn't be a difference for users, but this way we do manage
all of our containers from freedesktop.org
note: compared to the provious Dockerfile, we need to manually
add gcc, g++ and python*-wheel
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>