add docker-compose

docker-compose.yml

@@ -0,0 +1,16 @@
+version: '3'
+
+services:
+
+  db:
+    image: mariadb
+    container_name: db
+    environment:
+      - MARIADB_ROOT_PASSWORD=secret
+      - MARIADB_DATABASE=mx
+
+  app:
+    build: .
+    container_name: app
+    depends_on:
+      - db