Update to tip of master in periodic jobs

The intent of the periodic jobs is to run with latest master. If
they get enqueued, then other patches land, they'll still run with
the value of the zuul ref from when they were enqueued. That's not
what we want for prod, as it can lead to running old versions of
config.

We don't usually like doing this, but in this case, rather than
making us remember to add a flag every time a prod job gets added
to a periodic pipeline, how's about we just calculate it.

Change-Id: Ib999731fe132b1e9f197e51d74066fa75cb6c69b

playbooks/roles/sync-project-config/defaults/main.yaml

@@ -1,2 +1,3 @@
 project_config_dest: /opt/project-config
 project_config_subdir: ""
+infra_prod_run_from_master: "{{ zuul.pipeline|default('') in ['periodic', 'opendev-prod-hourly'] }}"

playbooks/roles/sync-project-config/tasks/main.yaml

@@ -3,9 +3,15 @@
     path: '{{ project_config_dest }}'
     state: directory
 
+- name: Update from master
+  when: infra_prod_run_from_master|bool
+  delegate_to: bridge.openstack.org
+  git:
+    repo: https://opendev.org/openstack/project-config
+    dest: '{{ project_config_src }}'
+    force: yes
+
 - name: Sync project-config repo
   synchronize:
     src: '{{ project_config_src }}/{{ project_config_subdir }}'
     dest: '{{ project_config_dest }}'
-
-

playbooks/zuul/run-production-playbook.yaml

@@ -31,6 +31,17 @@
       include_role:
         name: prepare-workspace-git
 
+    - name: Should we run from master
+      set_fact:
+        infra_prod_run_from_master: "{{ zuul.pipeline|default('') in ['periodic', 'opendev-prod-hourly'] }}"
+
+    - name: Update from master
+      when: infra_prod_run_from_master|bool
+      git:
+        repo: https://opendev.org/opendev/system-config
+        dest: /home/zuul/src/opendev.org/opendev/system-config
+        force: yes
+
     - name: Run the production playbook and capture logs
       block: