feat(ci): auto-run alembic migrations and seed on container start

- Add entrypoint.sh (migrate → seed → uvicorn)
- Add python-dotenv to requirements.txt
- Backend container uses entrypoint instead of direct uvicorn

Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>

Containerfile.backend

@@ -20,4 +20,4 @@ ENV PYTHONUNBUFFERED=1
 
 EXPOSE 8000
 
-CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]
+CMD ["sh", "scripts/entrypoint.sh"]

requirements.txt

@@ -8,6 +8,9 @@ sqlalchemy[asyncio]==2.0.36
 asyncpg==0.30.0
 alembic==1.14.0
 
+# Env
+python-dotenv==1.0.1
+
 # Auth
 PyJWT==2.9.0
 bcrypt==4.2.0

scripts/entrypoint.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+set -e
+
+echo "Running Alembic migrations..."
+python -m alembic upgrade head
+
+echo "Running seed data..."
+python scripts/seed.py
+
+echo "Starting uvicorn..."
+exec uvicorn main:app --host 0.0.0.0 --port 8000