Set image_base in cifmw_operator_build_operators for meta operator

image_base is used to specify the operator project name. It is used
openstack operator to include watcher operator catalog image into
the openstack-operator catalog image.

Sometimes image_base is set to empty when there is no github operator
depends-on. This pr sets the same in cifmw_operator_build_operators var.

The same is already added in telemetry-operator[1].

Links:
[1]. openstack-k8s-operators/telemetry-operator#724

Signed-off-by: Chandan Kumar (raukadah) <raukadah@gmail.com>

Author: raukadah

.zuul.yaml

@@ -218,6 +218,7 @@
           src: "{{ ansible_user_dir }}/src/github.com/openstack-k8s-operators/watcher-operator"
         - name: openstack-operator
           src: "{{ ansible_user_dir }}/src/github.com/openstack-k8s-operators/openstack-operator"
+          image_base: watcher
 - job:
     name: watcher-operator-validation-master
     parent: watcher-operator-validation-base
@@ -313,6 +314,7 @@
                   src: "{{ ansible_user_dir }}/src/github.com/openstack-k8s-operators/watcher-operator"
                 - name: openstack-operator
                   src: "{{ ansible_user_dir }}/src/github.com/openstack-k8s-operators/openstack-operator"
+                  image_base: watcher
         - watcher-operator-validation-master:
             branches: master
             override-checkout: main