feat: Add node selector for Victoria Metrics server

Configures the Victoria Metrics single server to be scheduled on a specific host, `ubuntu-4gb-nbg1-1`. This ensures being scheduled on the same node as the pvc is bound ot since it uses local-path volume

prototypes/victoria-metrics-single/helm/victoria-metrics-single.yaml

@@ -6,6 +6,8 @@ server:
       memory: 256Mi
     limits:
       memory: 512Mi
+  nodeSelector:
+    kubernetes.io/hostname: ubuntu-4gb-nbg1-1
   persistentVolume:
     enabled: true
     size: 10Gi

rendered/envs/production/victoria-metrics-single/statefulset-victoria-metrics-single-server.yaml

@@ -75,6 +75,8 @@ spec:
               name: server-volume
             - mountPath: /scrapeconfig
               name: scrapeconfig
+      nodeSelector:
+        kubernetes.io/hostname: ubuntu-4gb-nbg1-1
       securityContext: {}
       serviceAccountName: victoria-metrics-single-server
       terminationGracePeriodSeconds: 60