[epiphany] CI: Enable gsb for flatpak builds

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 66170163c605dd86a7898634208a13d4e17d95f6
Author: Jan-Michael Brummer <jan brummer tabos org>
Date:   Tue Sep 29 17:54:17 2020 +0200

    CI: Enable gsb for flatpak builds

 .gitlab-ci.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9032c9497..669a33331 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -26,14 +26,14 @@ check-code-style:
 flatpak:
   extends: '.flatpak'
   variables:
-    CONFIG_OPTS: '-Dprofile=Devel -Dunit_tests=enabled --werror -Dgsb_api_key=${GSB_API_KEY}'
+    CONFIG_OPTS: '-Dprofile=Devel -Dunit_tests=enabled --werror -Dgsb_api_key=${GSB_API_KEY} 
-Denable_gsb=true'
   except:
     - master
 
 flatpak master:
   extends: '.flatpak'
   variables:
-    CONFIG_OPTS: '-Dtech_preview=true -Dprofile=Devel -Dgsb_api_key=${GSB_API_KEY}'
+    CONFIG_OPTS: '-Dtech_preview=true -Dprofile=Devel -Dgsb_api_key=${GSB_API_KEY} -Denable_gsb=true'
   only:
     - master