Publish sample config file in the genconfig job

Add a post run to enable copying the sample file
generated to zuul logs.

Change-Id: Ifc1e71ce486ef9cefc07dbe9fb7c78ce150317bd

.zuul.yaml

@@ -372,6 +372,7 @@
       Run tests for manila project.
 
       Uses tox with the ``genconfig`` environment.
+    post-run: playbooks/manila-tox-genconfig/post.yaml
     vars:
       tox_envlist: genconfig
 

playbooks/manila-tox-genconfig/post.yaml

@@ -0,0 +1,10 @@
+- hosts: all
+  roles:
+    - role: fetch-tox-output
+  tasks:
+    - name: Copy generated config sample file
+      synchronize:
+        src: "{{ zuul.project.src_dir }}/etc/manila/manila.conf.sample"
+        dest: "{{ zuul.executor.log_root }}"
+        mode: pull
+        verify_host: true