Add octavia-v2-dsvm-scenario-centos-8

This patch adds a new non-voting scenario job to test against CentOS 8
amphora images. Until CentOS 8 controllers are supported in Devstack,
this job runs Ubuntu controllers.

Depends-On: https://review.opendev.org/#/c/697128/
Change-Id: Ia5cffced9d5af2de3a85b91be5358a15234f5e25
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index ccf2cb0..0ed5532 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -535,6 +535,15 @@
         OCTAVIA_AMP_IMAGE_SIZE: 3
 
 - job:
+    name: octavia-v2-dsvm-scenario-centos-8
+    parent: octavia-v2-dsvm-scenario
+    vars:
+      devstack_localrc:
+        OCTAVIA_AMP_BASE_OS: centos
+        OCTAVIA_AMP_DISTRIBUTION_RELEASE_ID: 8
+        OCTAVIA_AMP_IMAGE_SIZE: 3
+
+- job:
     name: octavia-v2-dsvm-scenario-ubuntu-bionic
     parent: octavia-v2-dsvm-scenario
     vars: