added nextcloud-specific configurations in Compose service definition

docker-compose.yml

@@ -1,6 +1,4 @@
 ---
-version: "3"
-
 services:
   nextcloud:
     image: nextcloud:${NC_VERSION}
@@ -12,6 +10,7 @@ services:
       - MYSQL_DATABASE=${NC_DATABASE_NAME}
       - MYSQL_USER=${NC_DATABASE_USER}
       - MYSQL_PASSWORD=${NC_DATABASE_PASS}
+      - OVERWRITEPROTOCOL=https
     labels:
       - traefik.enable=${TRAEFIK_ENABLED}
       - traefik.docker.network=${TRAEFIK_NETWORK}
@@ -29,6 +28,10 @@ services:
       - traefik.http.routers.https-${TRAEFIK_ROUTER}.tls.certresolver=${TRAEFIK_CERTRESOLVER}
       # specify a service so a custom port can be used
       - traefik.http.services.${TRAEFIK_SERVICE}.loadbalancer.server.port=${TRAEFIK_SERVICE_PORT}
+      # specify a custom middleware for nextcloud-specific configuration
+      - traefik.http.middlewares.nextcloud-redirectregex.redirectRegex.permanent=true
+      - traefik.http.middlewares.nextcloud-redirectregex.redirectRegex.regex="https://(.*)/.well-known/(card|cal)dav"
+      - traefik.http.middlewares.nextcloud-redirectregex.redirectRegex.replace="https://${1}/remote.php/dav/"
     networks:
       - internal
       - traefik