k8s: add affinity settings

k8s/apps/fleet-manager/base/django-q-worker.yml

@@ -86,3 +86,19 @@ spec:
         - name: file-config
           configMap:
             name: fleet-manager-file-config
+      affinity:
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+            - weight: 100
+              podAffinityTerm:
+                labelSelector:
+                  matchExpressions:
+                    - key: app
+                      operator: In
+                      values:
+                        - fleet-manager
+                    - key: component
+                      operator: In
+                      values:
+                        - django-q-worker
+                topologyKey: kubernetes.io/hostname