chg: dev: Improve GitLab CI build checking to build on all docker images, but...

chg: dev: Improve GitLab CI build checking to build on all docker images, but run system tests only on debian/sid amd64+i386

Merge branch '72-build-but-not-test-on-most-combinations' into 'master'

Closes #72

See merge request !44
10 jobs for 96-update-contributors-guide-and-move-it-at-top-level-so-it-s-recognised-by-gitlab
Status Job ID Name Coverage
  Build
canceled #1717
docker linux
build:debian:buster:i386

canceled #1714
docker linux
build:debian:jessie:amd64

canceled #1715
docker linux
build:debian:jessie:i386

canceled #1718
docker linux
build:debian:sid:amd64

canceled #1719
docker linux
build:debian:sid:i386

canceled #1716
docker linux
build:debian:stretch:amd64

canceled #1720
docker linux
build:ubuntu:trusty:amd64

canceled #1721
docker linux
build:ubuntu:xenial:i386

 
  Test
canceled #1722
linux docker
test:debian:sid:amd64

canceled #1723
linux docker
test:debian:sid:i386