Merge branch 'traefik-v2' into 'master'

Migrate to Traefik v2

See merge request picasoft/projets/dockerfiles!53

pica-mumble-web/docker-compose.yml

-version: "2.4"
+version: "3.7"
 networks:
-  docker_default:
+  proxy:
     external: true
-    name: "docker_default"
 
 services:
   mumble-web:
@@ -12,12 +11,12 @@ services:
     environment:
       MUMBLE_SERVER: "voice.picasoft.net:64738"
     networks:
-      - docker_default
+      - proxy
     volumes:
       - ./config.json:/home/node/dist/config.local.js
     labels:
-      - "traefik.frontend.rule=Host:voice.picasoft.net"
-      - "traefik.port=8080"
-      - "traefik.frontend.passHostHeader=true"
-      - "traefik.enable=true"
+      traefik.http.routers.mumble-web.entrypoints: websecure
+      traefik.http.routers.mumble-web.rule: Host(`voice.picasoft.net`)
+      traefik.http.services.mumble-web.loadbalancer.server.port: 8080
+      traefik.enable: true
     restart: unless-stopped