added secrets config file

nextcloud/Containerfile

@@ -109,8 +109,10 @@ RUN mkdir -p /vol/files && \
 
 # copy nextcloud config
 COPY --chown=www-data:www-data assets/config/ nextcloud/config/
-# make link to host config
-RUN ln -s /vol/data/host.config.php nextcloud/config/host.config.php
+# make link to host config & secret config
+RUN cd nextcloud/config && \
+    ln -s /vol/data/host.config.php && \
+    ln -s /vol/data/secret.config.php
 
 ###
 ### DB Auto Load/Dump
@@ -141,3 +143,9 @@ COPY assets/bugfix/apache2.override /etc/systemd/system/apache2.service.d/overri
 # bugfix for cron
 COPY assets/bugfix/cronfix /root/
 RUN chmod +x /root/cronfix && /root/cronfix
+
+###
+### Workdir
+###
+
+WORKDIR /vol/data

nextcloud/data/secret.config.php

@@ -0,0 +1,10 @@
+<?php
+$CONFIG = array(
+/** After your first install, place the auto-generated values for these parameters here
+    and uncomment them, so that they persist across re-deploys. */
+/**
+  'passwordsalt' => '',
+  'secret' => '',
+  'instanceid' => '',
+*/
+);