[gxml] CI: setting apt non-interactive

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit c957b390ee471d9b87d7f947637cbe35b969660f
Author: Daniel Espinosa <esodan gmail com>
Date:   Wed Sep 5 20:08:25 2018 -0500

    CI: setting apt non-interactive

 .gitlab-ci.yml | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6c88abe..757fb2b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -13,7 +13,10 @@ variables:
                 gobject-introspection libgirepository1.0-dev valadoc
                 yelp-tools iso-codes
 
+  GIT_SUBMODULE_STRATEGY: normal
+
 before_script:
+  - export DEBIAN_FRONTEND=noninteractive
   - apt update
   - apt -y install $DEPENDENCIES