[gnome-control-center] ci: Make armv8 and ppc64le manual jobs

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 500b69c552180b7db18454cde07b6c5ec43e9dd1
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon Sep 10 11:30:03 2018 -0300

    ci: Make armv8 and ppc64le manual jobs
    
    They consume too much CI resources and take a long time
    to run, which slows down the review and merge process.
    
    Make them manual from now on.

 .gitlab-ci.yml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 099c78353..89254b9bd 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -293,14 +293,16 @@ msan:
 
 armv8:
   <<: *multiarch
-  stage: test
+  stage: manual
+  when: manual
   variables:
     DOCKER_DRIVER: overlay
     IMAGE: "claudioandre/settings:fedora.aarch64"
 
 ppc64le:
   <<: *multiarch
-  stage: test
+  stage: manual
+  when: manual
   allow_failure: true
   variables:
     DOCKER_DRIVER: overlay