[pygobject] CI: use the "flatpak" tag for jobs using flatpak

[Christoph Reiter <creiter src gnome org>]

commit e181d41752316cf5cc80ec4e68ad6ac5ce276629
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Fri Feb 21 18:44:10 2020 +0100

    CI: use the "flatpak" tag for jobs using flatpak

 .gitlab-ci.yml | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f1d7f296..f93d3847 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -115,6 +115,8 @@ gnome-master:
   allow_failure: true
   stage: build_and_test
   image: registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:master
+  tags:
+    - flatpak
   script:
     - xvfb-run -a flatpak run --filesystem=host --share=network --socket=x11 --command=bash 
org.gnome.Sdk//master -x .gitlab-ci/test-flatpak.sh
 
@@ -122,6 +124,8 @@ gnome-master-gtk4:
   allow_failure: true
   stage: build_and_test
   image: registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:master
+  tags:
+    - flatpak
   script:
     - xvfb-run -a flatpak run --filesystem=host --share=network --socket=x11 --command=bash 
org.gnome.Sdk//master -x .gitlab-ci/test-flatpak-gtk4.sh
   artifacts: