Move all samples to the root dir

Signed-off-by: Anca Iordache <anca.iordache@docker.com>

react-express-mysql/docker-compose.yaml

@@ -0,0 +1,46 @@
+version: "3.7"
+services:
+  backend:
+    build:
+      args:
+      - NODE_ENV=development
+      context: backend
+    command: ../node_modules/.bin/nodemon --inspect=0.0.0.0:9229
+    environment:
+    - NODE_ENV=development
+    ports:
+    - 8080:80
+    - 9229:9229
+    - 9230:9230
+    volumes:
+    - ./backend:/opt/app:delegated
+    - ./backend/package.json:/opt/package.json
+    - ./backend/package-lock.json:/opt/package-lock.json
+    - back-notused:/opt/app/node_modules
+    depends_on: 
+      - db
+  db:
+    environment:
+      MYSQL_DATABASE: example
+      MYSQL_ROOT_PASSWORD_FILE: /run/secrets/db-password
+    image: mysql:5.7
+    restart: always
+    secrets:
+    - db-password
+    volumes:
+    - db-data:/var/lib/mysql
+  frontend:
+    build: frontend
+    ports:
+    - 80:9000
+    volumes:
+    - ./frontend:/project
+    - /project/node_modules
+    depends_on: 
+    - backend
+volumes:
+  back-notused: {}
+  db-data: {}
+secrets:
+  db-password:
+    file: db/password.txt