feat: add trigger for fetching logs properties

docs/deployment/logs.md

@@ -59,7 +59,7 @@ dokku logs:failed --all
 
 ### Docker Log Retention
 
-Docker log retention can be specified via the `logs:set` command by specifying a value for `max-size`. Log retention is set via injected docker options for all applications, but is also available via a trigger for alternative schedulers.
+Docker log retention can be specified via the `logs:set` command by specifying a value for `max-size`. Log retention is set via injected docker options for all applications, but is also available via the `logs-get-property` trigger for alternative schedulers.
 
 ```shell
 dokku logs:set node-js-app max-size 20m

docs/development/plugin-triggers.md

@@ -699,6 +699,22 @@ if [[ ! -f  "$DOKKU_ROOT/HOSTNAME" ]]; then
 fi
 ```
 
+### `logs-get-property`
+
+- Description: Fetches a given logs property value
+- Invoked by:
+- Arguments: `$APP` `$PROPERTY`
+- Example:
+
+```shell
+#!/usr/bin/env bash
+
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+APP="$1"; PROPERTY="$2"
+
+# TODO
+```
+
 ### `network-build-config`
 
 - Description: Rebuilds network configuration