add adminer

adminer/fleet.yaml

+defaultNamespace: database
+helm:
+  releaseName: ceticadminer
+  repo: https://cetic.github.io/helm-charts
+  chart: adminer
+  version: 0.2.1
+  values:
+    service:
+      type: ClusterIP
+    nodeSelector:
+      worker: "true"
+dependsOn:
+  - name: postgres