[guadec-web] Update .gitlab-ci.yml

[Oliver Gutiérrez <ogutierrez src gnome org>]

commit 3b900cc9c9f685f8dcd800b554822eab59e6af22
Author: Oliver Gutiérrez <ogutsua gmail com>
Date:   Tue Jul 10 15:59:55 2018 +0000

    Update .gitlab-ci.yml

 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 253450d..7f4f73d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,8 @@
 image: r3v1l/guadec-web-docker
 
 pages:
+  tags:
+    - do
   script:
     - pip install -r requirements.txt
     - npm install