Add persistent volume mounts for caddy config, data, and share directories, and
improve healthcheck settings with longer intervals, timeout, and start period
for better reliability
- Add caddy.env to gitignore for sensitive DNS credentials
- Replace manual SSL certificates with Let's Encrypt DNS challenge using
Namecheap
- Build custom Caddy image with namecheap DNS plugin
- Configure wildcard SSL for *.lan.poldebra.me domain
- Update docker-compose to use custom Caddy build and environment file
Note: we had to downgrade to Caddy 2.9, see
https://github.com/caddy-dns/namecheap/issues/14 for more information
