feat: add docker files

src/database/data-source.ts

@@ -0,0 +1,15 @@
+import { DataSource } from 'typeorm';
+import * as dotenv from 'dotenv';
+
+const ENV = process.env.NODE_ENV;
+
+dotenv.config({
+  path: !ENV ? '.env' : `.env.${ENV}`,
+});
+
+export default new DataSource({
+  type: 'postgres',
+  host: process.env.DATABASE_HOST,
+  port: Number(process.env.DATABASE_PORT),
+  username: process.env.DATABASE_USER,
+});