Zuul: Initial Airship-Promenade checks

This PS adds the skeleton for a set of zuul checks and gates for
Airship, using the framework from OpenStack-Helm.

Change-Id: Id6df20308f5568979d3ca9107aa348452b20ebf9
Signed-off-by: Pete Birley <pete@port.direct>

.zuul.yaml

@@ -0,0 +1,24 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+- project:
+    check:
+      jobs:
+        - airship-promenade-linter
+    gate:
+      jobs:
+        - airship-promenade-linter
+
+- job:
+    name: airship-promenade-linter
+    run: tools/gate/playbooks/zuul-linter.yaml
+    nodeset: openstack-helm-single-node