Split addy into rootless Quadlets with health checks and Traefik routing

addy.container.d/traefik-labels.conf.example

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+# Copy to traefik-labels.conf on the node, then set the real hostname.
+[Container]
+Network=webproxy.network
+Label=traefik.enable=true
+Label=traefik.docker.network=webproxy
+Label=traefik.http.routers.addy.rule=Host(`addy.example.com`)
+Label=traefik.http.routers.addy.entrypoints=websecure
+Label=traefik.http.routers.addy.tls=true
+Label=traefik.http.routers.addy.tls.certresolver=letsencrypt
+Label=traefik.http.routers.addy.service=addy
+Label=traefik.http.services.addy.loadbalancer.server.port=8000