You should subscribe to this RSS feed which informs about app and server updates. Additionally you can create a script which calls the following occ command on a regular base. You can analyse its output and send an email to your account etc., etc.:
./occ app:update --no-ansi --showonly
Sorry my mistake, the correct command you’re looking for is this:
Mind the two dashes in front of the option! Personally I wouldn’t use the command without that switch, because you don’t want to update existing packages, right?
> ./occ app:update --help
Description:
update an app or all apps
Usage:
app:update [options] [--] [<app-id>]
Arguments:
app-id update the specified app
Options:
--all update all updatable apps
--showonly show update(s) without updating
-h, --help Display this help message
-q, --quiet Do not output any message
-V, --version Display this application version
--ansi Force ANSI output
--no-ansi Disable ANSI output
-n, --no-interaction Do not ask any interactive question
--no-warnings Skip global warnings, show command output only
-v|vv|vvv, --verbose Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug