Add fork content-provider as soft dependency to functional job

Add the telemetry-container-image-content-provider job as a soft
dependency to the functional-tests-osp18, so that the content
provider job is used on changes to files related to the content
provider job, but default images from quay are used otherwise
to save CI resources.

Author: vyzigold

.zuul.yaml

@@ -28,7 +28,10 @@
 
 - job:
     name: functional-tests-osp18
-    dependencies: ["telemetry-openstack-meta-content-provider-master"]
+    dependencies: 
+      - name: telemetry-openstack-meta-content-provider-master
+      - name: telemetry-container-image-content-provider
+        soft: true
     parent: telemetry-operator-multinode-autoscaling
     description: |
       Run autoscaling functional tests, tempest tests, metrics
@@ -215,6 +218,11 @@
       jobs:
         - telemetry-openstack-meta-content-provider-master:
             override-checkout: main
+        - telemetry-container-image-content-provider:
+            files:
+              - ^ci/playbooks/container-image-build.yml$
+              - ^ci/playbooks/container-image-content-provider.yml$
+              - ^.zuul.yaml$
         - functional-chargeback-tests-osp18:
             files:
               - ^roles/telemetry_chargeback/.*$