.gitlab-ci.yml: Add snapshots

This also enables the CI build for scheduled pipelines so these can be
run on a daily basis.

.gitlab-ci.yml

@@ -1,13 +1,24 @@
 image: alpine:latest
 
+variables:
+  URL: https://gitlab.com/$CI_PROJECT_NAMESPACE
+
 pages:
   stage: deploy
   script:
   - mkdir .public
   - mv * .public/
   - mv .public public
+  - mkdir public/snapshots
+  - wget --quiet -O public/snapshots/sane-backends-git$(date +%F).tar.gz $URL/backends/repository/master/archive.tar.gz
+  - wget --quiet -O public/snapshots/sane-frontends-git$(date +%F).tar.gz $URL/frontends/repository/master/archive.tar.gz
+  - wget --quiet -O backends.zip $URL/backends/-/jobs/artifacts/master/download?job=archive
+  - unzip -oqd public/snapshots backends.zip
+  - wget --quiet -O frontends.zip $URL/frontends/-/jobs/artifacts/master/download?job=archive
+  - unzip -oqd public/snapshots frontends.zip
   artifacts:
     paths:
     - public
   only:
   - master
+  - schedules