Merge branch 'artifacts-expire-date' into 'master'

Artifacts expire date

What do you think @grzesiek?

The syntax will be simple:
```
job:
  artifacts:
    expire_in: 7d
```

- [x] Implement `expire_in`
- [x] Check current design of expiry information with @jschatz1 and @markpundsack 
- [x] Add tests in GitLab application for a `ExpireBuildArtifactsWorker` and for `ArtifactsController::keep`
- [x] Add user documentation how to use `artifacts:expire_in`
- [x] Prepare GitLab Runner changes to pass `expire_in`: gitlab-org/gitlab-ci-multi-runner!191
- [x] Fix `timeago` with help of @jschatz1
- [x] Merge latest master after builds view changes @iamphill
- [ ] Add Omnibus support for `expire_build_artifacts_worker` cron job
- [ ] Add documentation how to configure `expire_build_artifacts_worker`

This is based on https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4201.

See merge request !4200

2 files changed, 8 insertions, 2 deletions

diff --git a/db/migrate/20160518200441_add_artifacts_expire_date_to_ci_builds.rb b/db/migrate/20160518200441_add_artifacts_expire_date_to_ci_builds.rb
new file mode 100644
index 00000000000..915167b038d
--- /dev/null
+++ b/db/migrate/20160518200441_add_artifacts_expire_date_to_ci_builds.rb
@@ -0,0 +1,5 @@
+class AddArtifactsExpireDateToCiBuilds < ActiveRecord::Migration
+  def change
+    add_column :ci_builds, :artifacts_expire_at, :timestamp
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 3dccbbd50ba..c1e447d3cda 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -144,9 +144,9 @@ ActiveRecord::Schema.define(version: 20160610301627) do
     t.text     "commands"
     t.integer  "job_id"
     t.string   "name"
-    t.boolean  "deploy",             default: false
+    t.boolean  "deploy",              default: false
     t.text     "options"
-    t.boolean  "allow_failure",      default: false, null: false
+    t.boolean  "allow_failure",       default: false, null: false
     t.string   "stage"
     t.integer  "trigger_request_id"
     t.integer  "stage_idx"
@@ -161,6 +161,7 @@ ActiveRecord::Schema.define(version: 20160610301627) do
     t.text     "artifacts_metadata"
     t.integer  "erased_by_id"
     t.datetime "erased_at"
+    t.datetime "artifacts_expire_at"
   end
 
   add_index "ci_builds", ["commit_id", "stage_idx", "created_at"], name: "index_ci_builds_on_commit_id_and_stage_idx_and_created_at", using: :btree