Update Zuul file list

We have only a single job and that basically only runs when directory
deploy-guide gets updated. To be able to merge changes to other files,
overwrite the filelist of the job.

Change-Id: I6a1564422b72d1c116a828f3a4b17f3b0839edb7

.zuul.yaml

@@ -1,3 +1,21 @@
 - project:
     templates:
       - deploy-guide-jobs
+    check:
+      jobs:
+        - build-openstack-deploy-guide:
+            # Override restrictive default filelist since this is the
+            # only job for this repository. Otherwise we cannot merge
+            # changes that only touch files like .zuul.yaml or
+            # tox.ini.
+            files:
+              - ^.*
+    gate:
+      jobs:
+        - build-openstack-deploy-guide:
+            # Override restrictive default filelist since this is the
+            # only job for this repository. Otherwise we cannot merge
+            # changes that only touch files like .zuul.yaml or
+            # tox.ini.
+            files:
+              - ^.*