v1.2.0
Move placeholder validation to Provision to support runtime substitution
Caddy placeholders like {env.VALUE} should not be evaluated during Caddyfile parsing. The syntax {env.VALUE} is for runtime environmental variables, and so should be preserved as strings in configuration. The syntax {$VALUE} will result in environmental variables substituted at Caddyfile parse time, which is already performed by the Caddyfile parser.