switch sslproxy and fluentd to global service so each host runs one container.

build own image for letsencrypt, and tweek update job runtime.

dockerfiles/services/nextcloud/Dockerfile

@@ -1,4 +1,4 @@
-FROM nextcloud:12
+FROM nextcloud:latest
 
 RUN apt-get update && apt-get install -y smbclient && rm -rf /var/lib/apt/lists/*