Merge branch 'new-ci' of gitlab.orfeo-toolbox.org:sdinot/otb into new-ci

.gitlab-ci.yml

+variables:
+  DOCKER_DRIVER: overlay2
+
+stages:
+  - build
+
+.retry_twice:
+  retry:
+    max: 2
+    when:
+      - runner_system_failure
+      - stuck_or_timeout_failure
+
+build:ubuntu-18.04:release:
+  extends: .retry_twice
+  stage: build
+  image: registry.orfeo-toolbox.org/sdinot/otb:ubuntu-18.04-gcc
+  script:
+    - CI/build.sh