feat: actually mount the apps log dir

Also fix it so that the log directory is mountable from a custom path on the host if running dokku within a container.

plugins/logs/functions.go

@@ -72,6 +72,7 @@ func startVectorContainer(vectorImage string) error {
 		"run", "--detach", "--name", vectorContainerName, common.MustGetEnv("DOKKU_GLOBAL_RUN_ARGS"),
 		"--volume", "/var/lib/dokku/data/logs/vector.json:/etc/vector/vector.json",
 		"--volume", "/var/run/docker.sock:/var/run/docker.sock",
+		"--volume", common.MustGetEnv("DOKKU_LOGS_HOST_DIR") + ":/var/logs/dokku/apps",
 		vectorImage,
 		"--config", "/etc/vector/vector.json"}, " "))