[gjs: 2/3] CI: add a (manual) test for an LTS distro

[Philip Chimento <pchimento src gnome org>]

commit cfd47e366b4af44f595bde5646f4e71f2778a08a
Author: Claudio André <claudioandre br gmail com>
Date:   Tue Apr 24 16:49:42 2018 -0300

    CI: add a (manual) test for an LTS distro
    
    It allows the maintainer to keep an eye over the ability of a group
    of users to try GJS HEAD.

 .gitlab-ci.yml | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0672bdb4..ecf4b5a5 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -250,3 +250,12 @@ no_graphics:
     TEST: "check"
     BUILD_OPTS: "--without-cairo --without-gtk"
   when: manual
+
+lts:
+  <<: *build
+  stage: thorough_tests
+  image: claudioandre/spidermonkey:ubuntu.lts.gcc
+  variables:
+    CC: gcc
+    TEST: "check"
+  when: manual