Add a release job for sandbox

To help debug production problems that only show up with tags.

Change-Id: I538482e7b93e503edd0e805958d114633d1098f0

modules/openstack_project/files/jenkins_job_builder/config/misc.yaml

@@ -53,3 +53,15 @@
       - console-log
 
     node: '{node}'
+
+- job:
+    name: 'sandbox-tag'
+
+    builders:
+      - revoke-sudo
+      - gerrit-git-prep
+
+    publishers:
+      - console-log
+
+    node: 'bare-precise'

modules/openstack_project/files/zuul/layout.yaml

@@ -2526,6 +2526,10 @@ projects:
       - noop
     gate:
       - noop
+    pre-release:
+      - sandbox-tag
+    release:
+      - sandbox-tag
 
   - name: openstack-dev/specs-cookiecutter
     check: