Use private registry for watchtower.

monitoring/docker-compose.yaml

@@ -78,6 +78,7 @@ services:
     volumes:
       - /etc/localtime:/etc/localtime:ro
       - /var/run/docker.sock:/var/run/docker.sock
+      - ./watchtower-config.json:/config.json
     environment:
       WATCHTOWER_INCLUDE_STOPPED: true
       WATCHTOWER_MONITOR_ONLY: true

monitoring/watchtower-config.json

@@ -0,0 +1,10 @@
+{
+	"auths": {
+		"cs-registry.ddnss.de": {
+			"auth": "Y2hyaXM6U2VjcmV0MTI="
+		},
+		"https://index.docker.io/v1/": {
+			"auth": "Y3MyMjExOkU2U2Njc3ViRFJrYUppMlNMVSUh"
+		}
+	}
+}