fix: use preferred affinity instead of required for CI testing

Author: Tronix117

charts/wik-webservice/ci/full-values.yaml

@@ -76,9 +76,10 @@ webservice:
 
   affinity:
     nodeAffinity:
-      requiredDuringSchedulingIgnoredDuringExecution:
-        nodeSelectorTerms:
-          - matchExpressions:
+      preferredDuringSchedulingIgnoredDuringExecution:
+        - weight: 1
+          preference:
+            matchExpressions:
               - key: topology.kubernetes.io/zone
                 operator: In
                 values: