Docker: Use docker compose profiles for watchtower example #1192

Signed-off-by: Michael Mayer <michael@photoprism.app>

docker/examples/docker-compose.yml

@@ -125,13 +125,14 @@ services:
 
   ## Watchtower upgrades services automatically (optional)
   ## see https://docs.photoprism.app/getting-started/updates/#watchtower
-  #
-  # watchtower:
-  #   restart: unless-stopped
-  #   image: containrrr/watchtower
-  #   environment:
-  #     WATCHTOWER_CLEANUP: "true"
-  #     WATCHTOWER_POLL_INTERVAL: 7200 # checks for updates every two hours
-  #   volumes:
-  #     - "/var/run/docker.sock:/var/run/docker.sock"
-  #     - "~/.docker/config.json:/config.json" # optional, for authentication if you have a Docker Hub account
+  ## activate via "COMPOSE_PROFILES=update docker compose up -d"
+  watchtower:
+    restart: unless-stopped
+    image: containrrr/watchtower
+    profiles: ["update"]
+    environment:
+      WATCHTOWER_CLEANUP: "true"
+      WATCHTOWER_POLL_INTERVAL: 7200 # checks for updates every two hours
+    volumes:
+      - "/var/run/docker.sock:/var/run/docker.sock"
+      - "~/.docker/config.json:/config.json" # optional, for authentication if you have a Docker Hub account