* enable installer on docker first run
* add SESSION_COOKIE to compose file
* `APP_ENVIRONMENT_ONLY` is long gone
* session env vars no longer needed after #624
* set defaults to null if sqlite is selected
dockerfile
cmd updated to just start php-fpm
entrypoint
now starts caddy unless SKIP_CADDY has been set.
compose file
updated ports to work properly.
updated networks to use the correct network.
added commented port and variable to disable caddy
added further notes.