refactor: extract release_and_deploy calls to a plugin trigger

Better would be to separate the release and deploy aspects into distinct triggers - as well as have it release a specific image - but this is a good first pass.

plugins/common/release-and-deploy

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
+
+release_and_deploy "$@"