fix: exit migrator image when migrations are applied

Author: michaelbrusegard

dockerfile

@@ -41,4 +41,4 @@ USER nextjs
 
 EXPOSE 3000
 
-CMD ["bun", "run", "server.js"]
+CMD bun run server.js

migrations.dockerfile

@@ -10,4 +10,4 @@ COPY src/server/db ./src/server/db
 COPY src/env.ts ./src/env.ts
 COPY .env ./.env
 
-CMD ["bun", "run", "db:migrate"]
+CMD bun run db:migrate && exit 0