**SERVICES_TO_CHECK*: Names of services to check, separated by space.
***DEPLOY_KEY**: Private key paired with a public key accepted by remote machine, used to authenticate.
**COMPOSE_FILE*: Name of Docker Compose file with deployment definition. Multiple files are supported, separated by colon (`:`). Default `docker-compose.yml`.
**DEPLOY_PATH*: Path in remote host where deployment directory (containing temporary files) will be created. Default `~`.
**DEPLOY_DIR_NAME*: Name of directory containing files needed for deployment. Default `deploy`.
**DEFAULT_DEPLOY_FILES*: Files needed for deployment, if `${DEPLOY_DIR_NAME}` does not exist. Default `docker-compose*.yml .env`.
**REGISTRY_URL*: Address of Docker registry where Docker images to deploy are stored. Leave it empty to use Docker Hub registry.
**REGISTRY_USER*: Docker registry username of user with read permissions. **Required** for private registries.
**REGISTRY_PASS*: Docker registry user password of user with read permissions. **Required** for private registries.
**SERVICES_TO_CHECK*: Names of services to check after deployment, separated by space.