[gnome-clocks/bilelmoussaoui/ci/linter] CI: add a vala linter

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit 3708f4b1405d3c5cbe15bfcb3bc30134b386f9ad
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Tue Jan 28 16:05:11 2020 +0000

    CI: add a vala linter

 .gitlab-ci.yml | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 85e11c5..9e5d055 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,8 @@
 include: 'https://gitlab.gnome.org/GNOME/citemplates/raw/master/flatpak/flatpak_ci_initiative.yml'
+stages:
+  - lint
+  - test
+  - deploy
 
 variables:
     BUNDLE: "gnome-clocks-dev.flatpak"
@@ -24,3 +28,9 @@ stop_review:
 nightly:
   extends: '.publish_nightly'
 
+
+lint:
+  image: valalang/lint:latest
+  stage: .pre
+  script:
+    - io.elementary.vala-lint src