Add the run playbook for releasenotes and fix afs stamping

We were totally missing a run playbook.

For the post playbook we need to not run prepare-docs-for-afs but
instead just do the AFS stamp. Releasenotes are always built from
master.

Change-Id: I7d796f46aa30605ec722e5b442096b0ffd79bcda

playbooks/publish/releasenotes.yaml

@@ -1,6 +1,14 @@
+- hosts: all
+  tasks:
+    # TODO(mordred) We should really extract this into a role, but that's a
+    #               refactor for a different day.
+    - name: Write marker text
+      copy:
+        dest: "{{ zuul.project.src_dir }}/html/.root-marker"
+        content: "Project: {{ zuul.project.name }} Branch: {{ zuul.branch }} Build: {{ zuul.build }} Revision: {{ zuul.ref }}"
+
 - hosts: localhost
   roles:
-    - prepare-docs-for-afs
     - role: fetch-tox-output
       tox_envlist: releasenotes
     - role: fetch-sphinx-output

playbooks/releasenotes/run.yaml

@@ -0,0 +1,3 @@
+- hosts: all
+  roles:
+    - build-releasenotes