Merge branch 'ci_fix_fastbuild' into 'develop'

CI: fix image name to satisfy regexp

See merge request orfeotoolbox/otb!476

.gitlab-ci.yml

@@ -44,7 +44,7 @@ fast-build:
   extends: .general
   only: [merge_requests, branches]
   stage: precheck
-  image: $BUILD_IMAGE_REGISTRY/otb-ubuntu-native-develop
+  image: $BUILD_IMAGE_REGISTRY/otb-ubuntu-native-develop:latest
   before_script:
     - export GIT_LFS_SKIP_SMUDGE=1
     - git checkout $CI_COMMIT_REF_NAME