[libsoup/wip/ci] Add missing -y

[Claudio Saavedra <csaavedra src gnome org>]

commit 77a7f0441df24268a0886a49c57d7e32fa2bb601
Author: Claudio Saavedra <csaavedra igalia com>
Date:   Fri Aug 10 13:46:27 2018 +0000

    Add missing -y

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dc9530de..eed641e6 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,7 +3,7 @@ image: fedora:28
 build_stable:
   before_script:
     - dnf update -y --nogpgcheck
-    - dnf install 'dnf-command(builddep)'
+    - dnf install -y 'dnf-command(builddep)'
     - dnf builddep -y --nogpgcheck libsoup
   script:
     - ./autogen.sh