Fix Docker Traefik .yml and SERVER_DNS (#7858)

* Rename tls.yml to tls.yaml

Rename tls.yaml so it will be align to the entry in docker-compose-proxy.yml:

volumes:
  - ./tls.yaml:/etc/traefik/tls.yaml

To prevent error:
error="error reading configuration file: /etc/traefik/tls.yaml - read /etc/traefik/tls.yaml: is a directory"

* Update example.env

Added option for SERVER_URL

To prevent warning:
WARN[0000] The "SERVER_DNS" variable is not set. Defaulting to a blank string.

* Update example.env

Change SERVER_URL to SERVER_DNS

* Use .yml consistently

---------

Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>

Docker/freshrss/docker-compose-proxy.yml

@@ -33,7 +33,7 @@ services:
       - --certificatesResolvers.letsEncrypt.acme.storage=/etc/traefik/acme/acme.json
       - --certificatesResolvers.letsEncrypt.acme.email=${ADMIN_EMAIL}
       - --certificatesResolvers.letsEncrypt.acme.tlsChallenge=true
-      - --providers.file.filename=/etc/traefik/tls.yaml
+      - --providers.file.filename=/etc/traefik/tls.yml
     labels:
       - traefik.enable=false
 

Docker/freshrss/example.env

@@ -19,6 +19,7 @@ ADMIN_API_PASSWORD=freshrss
 
 # Address at which the FreshRSS instance will be reachable:
 BASE_URL=https://freshrss.example.net
+SERVER_DNS=freshrss.example.net
 
 # Database server (not relevant if using default SQLite)
 # Use the name of the Docker container if running on the same machine