Add a job to push pbrx container images

This job will be used to push docker images built by pbrx to the
openstackzuul Docker Hub account.

Change-Id: Id828b417512eed6b9e48d299398cd9049a7fb6ad

playbooks/pbrx-push/post.yaml

@@ -0,0 +1,18 @@
+- hosts: all
+  tasks:
+
+    - name: Docker Hub login
+      command: docker login -u {{ openstackzuul_docker_login.user }} -p {{ openstackzuul_docker_login.password }}
+      no_log: True
+
+    - block:
+
+       - name: Push prefixed container images
+         command: 'pbrx --debug push-images --prefix={{ pbrx_prefix }}'
+         args:
+           chdir: '{{ zuul_work_dir|default(zuul.project.src_dir) }}'
+
+      always:
+
+       - name: Docker Hub logout
+         command: docker logout

zuul.d/jobs.yaml

@@ -1322,3 +1322,15 @@
 
       The testing is done for Ubuntu Xenial.
     nodeset: ubuntu-xenial
+
+- job:
+    name: openstackzuul-pbrx-push-container-images
+    parent: pbrx-build-container-images
+    description: |
+      Publish images built by pbrx to openstackzuul Docker Hub account.
+      A value must be supplied for the pbrx_prefix variable.
+    protected: true
+    final: true
+    post-run: playbooks/pbrx-push/post.yaml
+    secrets:
+      - openstackzuul_docker_login

zuul.d/secrets.yaml

@@ -582,3 +582,18 @@
         user_domain_id: default
       region_name: ca-ymq-1
 
+- secret:
+    name: openstackzuul_docker_login
+    data:
+      user: 'openstackzuul'
+      password: !encrypted/pkcs1-oaep
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+          rbkgWewQP2/4BE/dHr5ndXHKQURikqo/RAGH2SqAdLSHs/lL9wB210Ci2PdIsr7ZubqA4
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