[epiphany] CI: Enable cache for all stages

[Michael Catanzaro <mcatanzaro src gnome org>]

commit d645adbdfba11bcf512128dc756fc054ab32967a
Author: Jan-Michael Brummer <jan brummer tabos org>
Date:   Wed Jul 29 11:17:22 2020 +0200

    CI: Enable cache for all stages

 .gitlab-ci.yml | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c83d7b23a..26c724b8a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,9 @@
 include: 'https://gitlab.gnome.org/GNOME/citemplates/raw/master/flatpak/flatpak_ci_initiative.yml'
 
+cache:
+  paths:
+    - _ccache/
+
 variables:
   BUNDLE: 'epiphany-git.flatpak'
   MANIFEST_PATH: 'org.gnome.Epiphany.json'