[nautilus: 3/4] gitlabci: Add caching for the flatpak build.

[Carlos Soriano <csoriano src gnome org>]

commit 7afe55aa0b628a1363382477d531d0b8b14c309a
Author: Jordan Petridis <jordanpetridis protonmail com>
Date:   Sun Mar 18 17:53:57 2018 +0200

    gitlabci: Add caching for the flatpak build.

 .gitlab-ci.yml | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d033e6945..15d528a87 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -36,6 +36,10 @@ flatpak:master:
         - .flatpak-builder/build/nautilus/_flatpak_build/meson-logs/meson-log.txt
         - .flatpak-builder/build/nautilus/_flatpak_build/meson-logs/testslog.txt
 
+    cache:
+        paths:
+        - .flatpak-builder/cache
+
 # Pick any distro to build the coverage
 fedora:rawhide:
     image: fedora:rawhide