[gnome-build-meta] .gitlab-ci.yml: Store all the downloaded git/tarballs in the gitlab cache.

[Javier Jardón Cabezas <jjardon src gnome org>]

commit 5f134aa03a3485e237971e30d6a4cb2a2bc2ef5a
Author: Javier Jardón <jjardon gnome org>
Date:   Thu Apr 5 11:18:05 2018 +0100

    .gitlab-ci.yml: Store all the downloaded git/tarballs in the gitlab cache.
    
    This saves us fetching them on every build

 .gitlab-ci.yml | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index cadb9fc..a6cdb2d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -11,6 +11,15 @@ variables:
 stages:
   - build
 
+
+# Store all the downloaded git and ostree repos in the cache.
+# This saves us fetching them on every build
+cache:
+  key: bst
+  paths:
+    - "${XDG_CACHE_HOME}/buildstream/sources/"
+
+
 before_script:
   # Remove any installed buildstream binary
   - pip3 uninstall -y buildstream