Added enviroment variables.

docker-compose.yml

@@ -5,6 +5,8 @@ services:
       context: ./backend
       dockerfile: Dockerfile
     container_name: backend
+    env_file:
+      - .env
     ports:
       - "5000:5000"
     volumes:
@@ -15,6 +17,8 @@ services:
       context: ./frontend
       dockerfile: Dockerfile
     container_name: frontend
+    env_file:
+      - .env
     ports:
       - "80:80"
     volumes:
@@ -27,10 +31,12 @@ services:
     ports:
       - "5432:5432"
     container_name: postgres
+    env_file:
+      - .env
     environment:
-      POSTGRES_USER: postgres
-      POSTGRES_PASSWORD: postgres
-      POSTGRES_DB: postgres
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+      POSTGRES_DB: ${POSTGRES_DB}
     volumes:
       - postgres-data:/var/lib/postgresql/data