fix: Add missing acme config

traefik/.env.example

@@ -1,2 +1,3 @@
 NAS_DOMAIN=nas.example.org
 NAS_URL=http://0.0.0.0:80
+CERT_EMAIL=admin@example.org

traefik/docker-compose.yml

@@ -26,6 +26,9 @@ services:
       - "--providers.docker.network=web"
       # Let's encrypt
       - "--certificatesresolvers.letsencrypt.acme.email=${CERT_EMAIL}"
+      - "--certificatesresolvers.letsencrypt.acme.httpchallenge.entrypoint=web"
+      - "--certificatesresolvers.letsencrypt.acme.storage=acme.json"
+      - "--certificatesresolvers.letsencrypt.acme.httpchallenge=true"
       # File provider
       - "--providers.file.directory=/conf.d/"
       - "--providers.file.watch=true"