Install release version of gitlab-dater onto GitLab server

Rather than than hacky development one I was using before

ansible/roles/gitlab/tasks/main.yml

@@ -18,3 +18,11 @@
     group: root
     mode: "0644"
   become: true
+
+# https://theorangeone.net/posts/gitlab-dater/
+- name: Install gitlab-dater
+  git:
+    repo: https://git.theorangeone.net/sys/gitlab-dater
+    dest: "{{ home }}/gitlab-dater"
+    depth: 1
+  become: true