added healthcheck so that django can wait until db starts

Author: pratikdaigavane

docker-compose.yml

@@ -19,10 +19,20 @@ services:
               python manage.py runserver 0.0.0.0:8000"
     env_file:
       - .env
+    depends_on:
+      db:
+        condition: service_healthy
+    links:
+      - db
     <<: *default-logging
 
   db:
     image: postgres:alpine
+    healthcheck:
+      test: [ "CMD-SHELL", "pg_isready -U postgres" ]
+      interval: 5s
+      timeout: 5s
+      retries: 5
     environment:
       - POSTGRES_DB=postgres
       - POSTGRES_USER=postgres