Merge branch '557-stock-onlyoffice' into 'master'

Use ONLYOFFICE stock container, version 5.5.1

Closes #557

See merge request openappstack/openappstack!289

flux/oas-apps/nextcloud.yaml

@@ -11,7 +11,7 @@ spec:
   releaseName: nc
   chart:
     git: https://open.greenhost.net/openappstack/nextcloud
-    ref: c77183d3661a4886e15d370904ca0cfc9e4da982
+    ref: e06a57b75be3a281680ecf1c1253094eea1ecabf
     path: .
   valuesFrom:
     - secretKeyRef: