Add .env file for docker-compose

check-env.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -e # Abort on error
+
+function check_env_vars () {
+  for name; do
+    : ${!name:?$name must not be empty}
+  done
+}
+
+if [ ! -f .env ]; then
+	echo 'A .env file must be present.'
+	exit 2
+fi
+
+if ! check_env_vars "ENVIRONMENT" "APP_NAME" "POSTGRES_USER" "POSTGRES_PASSWORD"; then
+	echo 'Some variables are not set in .env, please refer to script/check-env.sh for the list'
+	exit 4
+fi