Add watchtower, fixes and prepare for new caddy handling

synapse/docker-compose.yml

@@ -5,20 +5,31 @@ services:
   synapse:
     image: docker.io/matrixdotorg/synapse:latest
     restart: always
+    labels:
+      com.centurylinklabs.watchtower.enable: true
     environment:
       - SYNAPSE_CONFIG_PATH=/data/
     volumes:
       - ./data:/data
       - media_store:/media_store
-    ports:
-      - 8008:8008/tcp
+    networks:
+      services:
+        aliases:
+          - synapse
 
   synapse-admin:
     image: awesometechnologies/synapse-admin:latest
     restart: always
-    ports:
-      - "8009:80"
-    restart: always
+    labels:
+      com.centurylinklabs.watchtower.enable: true
+    networks:
+      services:
+        aliases:
+          - synapse-admin
 
 volumes:
   media_store:
+
+networks:
+  services:
+    external: true