add docker entrypoint script for database migrations and server startup

Author: kiyo9w

backend/Dockerfile

@@ -40,5 +40,12 @@ COPY ./app /app/app
 RUN --mount=type=cache,target=/root/.cache/uv \
     uv sync
 
-# Use Uvicorn directly for better compatibility with Render's $PORT
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "${PORT:-8000}", "--workers", "4"]
+# Copy the entrypoint script
+COPY ./docker-entrypoint.sh /app/docker-entrypoint.sh
+RUN chmod +x /app/docker-entrypoint.sh
+
+# Remove the old CMD
+# CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "${PORT:-8000}", "--workers", "4"]
+
+# Set the entrypoint
+ENTRYPOINT ["/app/docker-entrypoint.sh"]

backend/docker-entrypoint.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# Exit immediately if a command exits with a non-zero status.
+set -e
+
+# Run database migrations
+echo "Running database migrations..."
+alembic upgrade head
+
+echo "Migrations finished. Starting server..."
+# Execute the command passed as arguments to this script (which will be the Docker CMD)
+# Or, directly execute the intended Uvicorn command if CMD is removed/changed
+exec uvicorn app.main:app --host 0.0.0.0 --port ${PORT:-8000} --workers 4