adjust job template to account for master vs main

this change makes the opendev job template define
override-checkout: main to account for the fact that
the job will run on master.

i also add a pragma section to make main and master
implied alias and declare the default branch of this
repo to be main.

.zuul.yaml

@@ -204,34 +204,43 @@
 
 - project:
     name: openstack-k8s-operators/nova-operator
+    default-branch: main
     github-check:
       jobs:
         - openstack-meta-content-provider
         - nova-operator-kuttl
         - nova-operator-tempest-multinode
         - nova-operator-tempest-multinode-ceph
 
+- pragma:
+    implied-branch-matchers: True
+    implied-branches:
+      - main
+      - master
+
 ##########################################################
 #                                                        #
 #               Project Template                         #
 #                                                        #
 ##########################################################
+
 - project-template:
     name: opendev-nova-edpm-pipeline
     description: |
       Project template to run meta content provider and
       EDPM job with master opendev and github operator content in
       openstack-experimental pipeline.
-    openstack-experimental:
+    openstack-experimental: &experimentalJobs
       jobs:
         - openstack-meta-content-provider:
+            override-checkout: main
             vars:
               cifmw_bop_openstack_release: master
               cifmw_bop_dlrn_baseurl: "https://trunk.rdoproject.org/centos9-master"
               cifmw_repo_setup_branch: master
         - nova-operator-tempest-multinode: &job_vars
+            override-checkout: main
             vars:
               cifmw_repo_setup_branch: master
-            dependencies:
-              - openstack-meta-content-provider
         - nova-operator-tempest-multinode-ceph: *job_vars
+    experimental: *experimentalJobs