Update docker-compose.yml

Advertise exit node is required to allow smokeping container access out via ts container
Commenting master_url make simple single node operation easier

docker-compose.yml

@@ -7,6 +7,7 @@ services:
       - TS_AUTHKEY={{YOUR_TAILSCALE_AUTHKEY}}
       - TS_STATE_DIR=/var/lib/tailscale
       - TS_SERVE_CONFIG=/config/serve.json
+      - TS_EXTRA_ARGS=--advertise-exit-node
     volumes:
       - ./tailscale/tailscale-data:/var/lib/tailscale
       - ./tailscale/config:/config
@@ -22,7 +23,8 @@ services:
       - PUID=1000
       - PGID=1000
       - TZ=Etc/UTC
-      - MASTER_URL=http://127.0.0.1:80/smokeping/ #optional
+      #commenting the following line is simpler for single node usage
+      #- MASTER_URL=http://127.0.0.1:80/smokeping/ #optional
       - SHARED_SECRET=password #optional
       - CACHE_DIR=/tmp #optional
     volumes: