I use Caddy for this. I’ll leave links to the documentation as well as a few examples.

Here’s the documentation for wildcard certs. caddyserver.com/docs/automatic-https#wildcard-cer…

Here’s how you add DNS providers to Caddy without Docker. caddy.community/t/…/8148

Here’s how you do it with Docker. github.com/docker-library/docs/tree/master/caddy#…

Look for the DNS provider in this repository first. github.com/caddy-dns

Here’s documentation about using environment variables. caddyserver.com/docs/caddyfile/concepts#environme…

Docker

A few examples of Dockerfiles. These will build Caddy with DNS support.

DuckDNS

FROM caddy:2-builder AS builder
RUN xcaddy build --with github.com/caddy-dns/duckdns

FROM caddy:2
COPY --from=builder /usr/bin/caddy /usr/bin/caddy

Cloudflare

FROM caddy:2-builder AS builder
RUN xcaddy build --with github.com/caddy-dns/cloudflare

FROM caddy:2
COPY --from=builder /usr/bin/caddy /usr/bin/caddy

Porkbun

FROM caddy:2-builder AS builder
RUN xcaddy build --with github.com/caddy-dns/porkbun

FROM caddy:2
COPY --from=builder /usr/bin/caddy /usr/bin/caddy

Configure DNS provider

This is what to add the the Caddyfile, I’ve used these in the examples that follow this section. You can look at the repository for the DNS provider to see how to configure it for example.

DuckDNS

github.com/caddy-dns/cloudflare?tab=readme-ov-fil…

tls {
	dns duckdns {env.DUCKDNS_API_TOKEN}
}

CloudFlare

github.com/caddy-dns/cloudflare?tab=readme-ov-fil… Dual-key

tls {
	dns cloudflare {
		zone_token {env.CF_ZONE_TOKEN}
		api_token {env.CF_API_TOKEN}
	}
}

Single-key

tls {
	dns cloudflare {env.CF_API_TOKEN}
}

PorkBun

github.com/caddy-dns/porkbun?tab=readme-ov-file#c… Global

{
	acme_dns porkbun {
			api_key {env.PORKBUN_API_KEY}
			api_secret_key {env.PORKBUN_API_SECRET_KEY}
	}
}

or per site

tls {
	dns porkbun {
			api_key {env.PORKBUN_API_KEY}
			api_secret_key {env.PORKBUN_API_SECRET_KEY}
	}
}

Caddyfile

And finally the Caddyfile examples.

DuckDNS

Here’s how you do it with DuckDNS.

*.example.org {
        tls {
                dns duckdns {$DUCKDNS_TOKEN}
        }

        @hass host home-assistant.example.org
        handle @hass {
                reverse_proxy home-assistant:8123
        }
}

Also you can use environment variables like this.

*.{$DOMAIN} {
        tls {
                dns duckdns {$DUCKDNS_TOKEN}
        }

        @hass host home-assistant.{$DOMAIN}
        handle @hass {
                reverse_proxy home-assistant:8123
        }
}

CloudFlare.

*.{$DOMAIN} {
        tls {
	        dns cloudflare {env.CF_API_TOKEN}
        }

        @hass host home-assistant.{$DOMAIN}
        handle @hass {
                reverse_proxy home-assistant:8123
        }
}

Porkbun

*.{$DOMAIN} {
        tls {
	        dns porkbun {
			api_key {env.PORKBUN_API_KEY}
			api_secret_key {env.PORKBUN_API_SECRET_KEY}
	        }
        }

        @hass host home-assistant.{$DOMAIN}
        handle @hass {
                reverse_proxy home-assistant:8123
        }
}