Add periodic-weekly pipeline with platform jobs

Originally we only had the openeuler jobs there, but the other platforms
could also do with some regular testing.

Change-Id: I93526a4c592d85acd4debf72eb59e306ab8e6382
diff --git a/.zuul.yaml b/.zuul.yaml
index 7593011..47466cb 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -1053,3 +1053,13 @@
     periodic:
       jobs:
         - devstack-no-tls-proxy
+    periodic-weekly:
+      jobs:
+        - devstack-platform-centos-9-stream
+        - devstack-platform-debian-bookworm
+        - devstack-platform-debian-bullseye
+        - devstack-platform-rocky-blue-onyx
+        - devstack-platform-ubuntu-jammy-ovn-source
+        - devstack-platform-ubuntu-jammy-ovs
+        - devstack-platform-openEuler-22.03-ovn-source
+        - devstack-platform-openEuler-22.03-ovs