DNSLink
Blumen supports automatic DNS updates via DNSLink. Right now only Cloudflare is supported.
Setup
Cloudflare
Obtain Zone ID from the Cloudflare dashboard:

You will also need an API token with permissions for editing Web3 gateways:

Add your Zone ID and API token to environment:
BLUMEN_CF_KEY=...-...
BLUMEN_CF_ZONE_ID=...BLUMEN_CF_KEY=...-...
BLUMEN_CF_ZONE_ID=...