Allow bind ports to be customized in .env #72
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This change allows the Caddy bind ports to be customized with .env variables. This allows more versatile deployments behind reverse proxies without needing changes that will cause conflict when upgrading.
When hosting Ghost containers behind a reverse proxy, or an a machine where ports 80/443 are already in use, we need to edit
compose.ymlwith different ports. This change simplifies that by allowing thost changes to be made in.env. This also makes updates easier, as we don't need to worry about conflicts incompose.yml.I'm happy to consider other approaches; putting this here as a starting point.