[gnome-screenshot/wip/exalm/ci] ci: Move flatpak job to build stage

[Alexander Mikhaylenko <alexm src gnome org>]

commit 80dcdb144bccb071712ece69cf009bcb2d1d0b45
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Tue Mar 10 01:05:44 2020 +0500

    ci: Move flatpak job to build stage
    
    The pipeline must have at least one job that's not in .pre or .post
    stages. This means that if the pipeline consists entirely of jobs from the
    template, it won't run. Introduce a stage artificially to work around that.

 .gitlab-ci.yml | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bf10119..8aa3b5a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,10 +1,14 @@
 include: 'https://gitlab.gnome.org/GNOME/citemplates/raw/master/flatpak/flatpak_ci_initiative.yml'
 
+stages:
+  - build
+
 variables:
   BUNDLE: 'org.gnome.Screenshot.Devel.flatpak'
 
 flatpak:
   extends: '.flatpak'
+  stage: build
   variables:
     MANIFEST_PATH: 'org.gnome.Screenshot.json'
     MESON_ARGS: ''