feat: Adds watchtower

watchtower/README.md

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+# Watchtower
+
+[Watchtower](https://github.com/containrrr/watchtower) is a tool that watches for new docker images
+based on their `tag`, and will pull new images when available and restart services that include a
+label of `com.centurylinklabs.watchtower.enable: true`.

watchtower/compose.yml

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+networks:
+  proxy:
+    external: true
+  backend:
+    external: true
+
+services:
+  watchtower:
+    image: containrrr/watchtower:latest
+    container_name: watchtower
+    restart: unless-stopped
+    networks:
+      - proxy
+      - backend
+    environment:
+      WATCHTOWER_CLEANUP: true
+      WATCHTOWER_LABEL_ENABLE: true
+      WATCHTOWER_TIMEOUT: 30s
+      TZ: "America/New_York"
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+