{
  "env": [
    "S3_ACCESS_KEY_ID=...",
    "S3_SECRET_ACCESS_KEY=...",
    "S3_REGION=...",
    "S3_BUCKET=..."
  ],
  "name": "<app-name>",
  "path": "/path/to/your/project",
  "release_command": "MIX_ENV=prod mix ecto.migrate"
}