new: [nextcloud] new charm requires an ``admin-password`` now

compose.yml

@@ -119,10 +119,18 @@ logrotate:
 
 
 nextcloud:
-  #options:
-  #  admin:
-  #    user: admin
-  #    password: xxx
+  options:
+    ## If not set, it'll be automatically created and stored in
+    ##   configstore /etc/nextcloud/user_pass
+    ## You can set it afterwards without issue (password will then be changed
+    ##   to value specified) for the user 'admin'.
+    admin-password: mypass
+
+    ## Or you could alternatively want to use this way:
+    #admin:
+    #  ## Changing user will create a new user and NOT delete previous user
+    #  #user: admin
+    #  password: XXXXXX
   relations:
     web-proxy:
       frontend: