Optimize docker files

docker/docker-compose.yml

@@ -0,0 +1,18 @@
+version: '3'
+
+services:
+  nsupdate:
+    image: nsupdate
+    container_name: nsupdate
+    build:
+      context: https://github.com/chrisb86/nsupdate.git
+      dockerfile: docker/Dockerfile
+    environment:
+      - SCHEDULE="*\2 * * * *"
+      - TZ=Europe/Berlin
+      - NSUPDATE_INWX_USER=YOUR_INWX_USERNAME
+      - NSUPDATE_INWX_PASSWORD=YOUR_INWX_PASSWORD
+    volumes:
+      - ./data:/config
+      - ./log:/log
+    restart: unless-stopped