Add postgres db service

.env

@@ -0,0 +1,6 @@
+POSTGRES_USER=acacia
+POSTGRES_PASSWORD=acacia    
+POSTGRES_DB=acacia
+POSTGRES_HOST=db
+PGDATA=/tmp/data
+DB_NAME=acacia

docker-compose.yml

@@ -1,7 +1,18 @@
-version: '3'
+version: '3.7'
 services:
+
+  db:
+    image: postgres:11.5
+    container_name: acacia_db
+    env_file: 
+      - .env
+    ports:
+      - "5432:5432"
+    networks: 
+      - acacia_network
+
   acacia-back:
-    container_name: acacia-backend
+    container_name: acacia_backend
     build:
       context: .
       dockerfile: Dockerfile
@@ -11,6 +22,16 @@ services:
       python manage.py migrate &&
       python manage.py runserver 0.0.0.0:8080"
     ports:
-    - "8080:8080"
+      - "8080:8080"
     volumes:
-    - .:/code
+      - .:/code
+    env_file:
+      - .env
+    networks: 
+      - acacia_network
+    depends_on:
+      - db
+
+networks: 
+  acacia_network:
+    name: acacia_network

requirements.txt

@@ -1,2 +1,3 @@
 Django==2.2.4
-djangorestframework==3.10.0
+djangorestframework==3.10.0
+psycopg2==2.8.3