Add watchtower, fixes and prepare for new caddy handling

watchtower/.env

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+WATCHTOWER_LABEL_ENABLE=true
+WATCHTOWER_CLEANUP=true
+
+WATCHTOWER_NOTIFICATIONS=email
+WATCHTOWER_NOTIFICATION_EMAIL_FROM=watchtower@serguzim.me
+WATCHTOWER_NOTIFICATION_EMAIL_TO=tobias@msrg.cc
+WATCHTOWER_NOTIFICATION_EMAIL_SERVER=mail.serguzim.me
+WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PORT=587
+WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER=watchtower@serguzim.me
+WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD=
+WATCHTOWER_NOTIFICATION_EMAIL_DELAY=5

watchtower/docker-compose.yml

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+version: "3"
+
+services:
+  watchtower:
+    image: containrrr/watchtower
+    restart: always
+    env_file:
+      - .env
+      - .secret.env
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock