feat: add postgres DB and mount for test files

docker-compose.yml

@@ -1,12 +1,30 @@
 version: '3.8'
 
 services:
+  db:
+    image: postgres:latest
+    ports:
+      - "5432:5432"
+    environment:
+      - POSTGRES_DB=${COMPOSE_PROJECT_NAME}
+      - POSTGRES_USER=${COMPOSE_PROJECT_NAME}_user
+      - POSTGRES_PASSWORD=${COMPOSE_PROJECT_NAME}_pwd
+    volumes:
+      - postgres:/var/lib/postgresql/data
   web:
     build: .
     ports:
       - "8080:8080"
     volumes:
       - ./src:/app/src
+      - ./tests:/app/tests
     environment:
       - ALLOWED_HOSTS=localhost,127.0.0.1,0.0.0.0
+      - DATABASE_NAME=${COMPOSE_PROJECT_NAME}
+      - DATABASE_USER=${COMPOSE_PROJECT_NAME}_user
+      - DATABASE_PASSWORD=${COMPOSE_PROJECT_NAME}_pwd
     tty: true
+
+volumes:
+  postgres:
+    name: ${COMPOSE_PROJECT_NAME}_postgres