add docker-compose instructions.

Author: lymagics

Dockerfile

@@ -0,0 +1,11 @@
+FROM python:3.11-slim
+
+ENV PYTHONUNBUFFERED 1
+
+COPY requirements.txt requirements.txt
+RUN pip install -r requirements.txt
+
+COPY oas.yaml oas.yaml
+COPY waitlist waitlist
+COPY src src
+WORKDIR /src

src/.env.exp api.env.exp

@@ -0,0 +1,25 @@
+version: '3.9'
+
+services:
+  api:
+    build: .
+    command: >
+      sh -c "python /waitlist/wait_for_postgres.py &&
+             python manage.py migrate &&
+             python manage.py runserver 0.0.0.0:8000"
+    env_file:
+      - api.env
+    ports:
+      - '8000:8000'
+    depends_on:
+      - db
+
+  db:
+    image: postgres
+    environment:
+      - POSTGRES_PASSWORD=admin
+    volumes:
+      - posts-db:/var/lib/postgresql/data
+
+volumes:
+  posts-db:

docker-compose.yaml

@@ -0,0 +1,22 @@
+import time
+
+import psycopg2
+from environs import Env
+
+env = Env()
+env.read_env()
+
+
+def wait_for_postgres_to_come_up():
+    deadline = time.time() + 120
+    while time.time() < deadline:
+        try:
+            return psycopg2.connect(env.str('DJANGO_DATABASE_URL'))
+        except psycopg2.OperationalError:
+            time.sleep(0.5)
+    raise Exception('Postgres never came up')
+
+
+if __name__ == '__main__':
+    wait_for_postgres_to_come_up()
+