'@admin rewrite ...' is parsed as a one-liner matcher DEFINITION, so it
re-defined @admin and Caddy rejected the config ('matcher is defined more
than once'), crash-looping the container. Per the Caddyfile matcher docs the
matcher token is the first ARGUMENT after the directive: 'rewrite @admin
/admin.html'. The '*' disambiguator is only needed pre-2.8.0. Validated the
rendered config against the porkbun image: 'Valid configuration'.
Frank
25af3d9fdf