devtools/gerrit: disable owners-autoassign

This plugin sounds good in practice, but has a flaw: it assigns _all_
owners automatically, even if a change is already submitted by one of
the other owners.

We might come back to it later - or implement something of our own.

Change-Id: Iff179ea623c1371c2c861b6d7ec2e7749c940369
diff --git a/devtools/gerrit/kube/gerrit.libsonnet b/devtools/gerrit/kube/gerrit.libsonnet
index eaac3a0..ce2982d 100644
--- a/devtools/gerrit/kube/gerrit.libsonnet
+++ b/devtools/gerrit/kube/gerrit.libsonnet
@@ -38,7 +38,7 @@
             address: "gerrit@hackerspace.pl",
         },
 
-        tag: "3.0.8",
+        tag: "3.0.8-r1",
         image: "registry.k0.hswaw.net/devtools/gerrit:" + cfg.tag,
         resources: {
             requests: {