added variables for pufferfish, also added setup only test (#1399)

tests/setuponlytests/pufferfish/docker-compose.yml

@@ -0,0 +1,13 @@
+version: "3"
+
+services:
+  mc:
+    restart: "no"
+    image: ${IMAGE_TO_TEST:-itzg/minecraft-server}
+    environment:
+      EULA: "TRUE"
+      SETUP_ONLY: "TRUE"
+      TYPE: PUFFERFISH
+      VERSION: ${MINECRAFT_VERSION:-LATEST}
+    volumes:
+      - ./data:/data

tests/setuponlytests/pufferfish/require.sh

@@ -0,0 +1 @@
+[[ $MINECRAFT_VERSION == LATEST ]] || exit 1

tests/setuponlytests/pufferfish/verify.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+mc-image-helper assert fileExists "/data/pufferfish-*"