Improve configuration with Makefile

- Add Makefile
 - Add environment configuration file
 - Use env with docker-compose and Makefile"

.env

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# See https://docs.docker.com/compose/environment-variables/#the-env-file
+
+MYSQL_DUMPS_DIR=data/db/dumps
+MYSQL_DATABASE=test
+MYSQL_ROOT_USER=root
+MYSQL_ROOT_PASSWORD=root
+MYSQL_USER=dev
+MYSQL_PASSWORD=dev