Add zuul-registry crontab entry

This is so we can prune images regularly.

Change-Id: If1d34ac0a6c2eece92b854e6fe0bdf3602fbb02b
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

defaults/main.yaml

@@ -46,6 +46,12 @@ zuul_registry_file_ssl_key_mode: 0600
 zuul_registry_file_ssl_key_owner: "{{ zuul_registry_user_name }}"
 zuul_registry_file_ssl_key_src: etc/zuul-registry/ssl/cert.key
 
+zuul_registry_file_crontab_dest: /etc/cron.d/zuul-registry
+zuul_registry_file_crontab_group: root
+zuul_registry_file_crontab_mode: 0644
+zuul_registry_file_crontab_owner: root
+zuul_registry_file_crontab_src: etc/cron.d/zuul-registry.j2
+
 # tasks/install.yaml
 zuul_registry_git_dest: "{{ ansible_user_dir }}/src/opendev.org/zuul/zuul-registry"
 zuul_registry_git_uri: https://opendev.org/zuul/zuul-registry

tasks/config.yaml

@@ -53,3 +53,12 @@
     owner: "{{ zuul_registry_file_ssl_key_owner }}"
     src: "{{ zuul_registry_file_ssl_key_src }}"
   register: zuul_registry_file_ssl_key
+
+- name: Install zuul-registry crontab
+  become: true
+  template:
+    dest: "{{ zuul_registry_file_crontab_dest }}"
+    group: "{{ zuul_registry_file_crontab_group }}"
+    mode: "{{ zuul_registry_file_crontab_mode }}"
+    owner: "{{ zuul_registry_file_crontab_owner }}"
+    src: "{{ zuul_registry_file_crontab_src }}"

templates/etc/cron.d/zuul-registry.j2

@@ -0,0 +1,4 @@
+# This file is generated by Ansible
+#  DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
+#
+0 3 * * * {{ zuul_registry_user_name }} {{ zuul_registry_pip_virtualenv | default('/usr/local') }}/bin/zuul-regsitry -c {{ zuul_registry_file_registry_yaml_dest }} prune