Use central config for env vars

commands

@@ -2,16 +2,7 @@
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 source "$(dirname "$0")/../common/functions"
 source "$(dirname "$0")/functions"
-
-POSTGRES_IMAGE=${POSTGRES_IMAGE:="postgres"}
-POSTGRES_IMAGE_VERSION=${POSTGRES_IMAGE_VERSION:="9.5"}
-POSTGRES_ROOT=/var/lib/dokku/services/postgres
-
-PLUGIN_COMMAND_PREFIX="postgres"
-PLUGIN_DATA_ROOT=$POSTGRES_ROOT
-PLUGIN_SERVICE="Postgres"
-PLUGIN_IMAGE=$POSTGRES_IMAGE
-PLUGIN_IMAGE_VERSION=$POSTGRES_IMAGE_VERSION
+source "$(dirname "$0")/config"
 
 if [[ ! -d $PLUGIN_DATA_ROOT ]]; then
   dokku_log_fail "$PLUGIN_SERVICE: Please run: sudo dokku plugins-install"