Add neutron-tempest-mariadb-full periodic job

Depends-On: https://review.opendev.org/681201
Change-Id: I070dd78a26d269a4f094cc37d3fcff709682be35

.zuul.yaml

@@ -85,6 +85,7 @@
       jobs:
         - neutron-functional
         - neutron-tempest-postgres-full
+        - neutron-tempest-mariadb-full
         - neutron-tempest-with-os-ken-master
     experimental:
       jobs:
@@ -410,6 +411,19 @@
         mysql: false
     irrelevant-files: *tempest-irrelevant-files
 
+- job:
+    name: neutron-tempest-mariadb-full
+    parent: tempest-integrated-networking
+    timeout: 7800
+    required-projects:
+      - openstack/devstack-gate
+      - openstack/neutron
+      - openstack/tempest
+    vars:
+      devstack_localrc:
+        MYSQL_SERVICE_NAME: mariadb
+    irrelevant-files: *tempest-irrelevant-files
+
 - job:
     name: neutron-tempest-with-os-ken-master
     parent: legacy-dsvm-base